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Frans Helmerhorst

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TOP 3
M Raps; Frits R Rosendaal; Jan Rosing; S Thomassen; B E P B Ballieux; Frans M Helmerhorst; H A A M Van Vliet
Resistance to APC and SHBG levels during use of a four-phasic oral contraceptive containing dienogest and estradiol valerate: a randomized controlled trial.
M Raps; Pieter H Reitsma; Frits R Rosendaal; Jan Rosing; Per Morten Sandset; Anders Dahm; K Fleischer; Frans M Helmerhorst; H A A M Van Vliet
The effect of different hormonal contraceptives on plasma levels of free protein S and free TFPI.
M Raps; F R Rosendaal; Jan Rosing; B H Stegeman; S Thomassen; V A Van Hylckama; B E P B Ballieux; K Fleischer; Frans M Helmerhorst; H A A M Van Vliet
Sex hormone-binding globulin as a marker for the thrombotic risk of hormonal contraceptives: reply to a rebuttal.

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2013: M Raps; Frits R Rosendaal; Jan Rosing; S Thomassen; B E P B Ballieux; Frans M Helmerhorst; H A A M Van Vliet
Resistance to APC and SHBG levels during use of a four-phasic oral contraceptive containing dienogest and estradiol valerate: a randomized controlled trial.
Journal of thrombosis and haemostasis : JTH 2013;11(5):855-61.
2013: M Raps; Pieter H Reitsma; Frits R Rosendaal; Jan Rosing; Per Morten Sandset; Anders Dahm; K Fleischer; Frans M Helmerhorst; H A A M Van Vliet
The effect of different hormonal contraceptives on plasma levels of free protein S and free TFPI.
Thrombosis and haemostasis 2013;109(4):606-13.
2013: M Raps; F R Rosendaal; Jan Rosing; B H Stegeman; S Thomassen; V A Van Hylckama; B E P B Ballieux; K Fleischer; Frans M Helmerhorst; H A A M Van Vliet
Sex hormone-binding globulin as a marker for the thrombotic risk of hormonal contraceptives: reply to a rebuttal.
Journal of thrombosis and haemostasis : JTH 2013;11(2):396-7.
2013: Frits R Rosendaal; Frans M Helmerhorst
Authors' reply to Costescu and Waddington.
BMJ (Clinical research ed.) 2013;346():f2369.
2013: Frans M Helmerhorst; Frits R Rosendaal
Is an EMA review on hormonal contraception and thrombosis needed?
BMJ (Clinical research ed.) 2013;346():f1464.
2013: R E J Roach; Frits R Rosendaal; suzanne cannegieter; Frans M Helmerhorst; Willem M Lijfering; Astrid Van Hylckama Vlieg
The risk of venous thrombosis in women over 50 years old using oral contraception or postmenopausal hormone therapy.
Journal of thrombosis and haemostasis : JTH 2013;11(1):124-31.
2012: M Raps; Frits R Rosendaal; Jan Rosing; S Thomassen; B E P B Ballieux; K Fleischer; Frans M Helmerhorst; H A A M Van Vliet
Sex hormone-binding globulin as a marker for the thrombotic risk of hormonal contraceptives.
Journal of thrombosis and haemostasis : JTH 2012;10(6):992-7.
2011: Caroline E Hogen Esch; Frits Koning; M Luisa Mearin; Anja Roos; Friedo W Dekker; Frans M Helmerhorst; Mechteld J L Van Rijssen; Joachim J Schweizer
Screening for unrecognized coeliac disease in subfertile couples.
Scandinavian journal of gastroenterology 2011;46(12):1423-8.
2011: P C M de Groot; Olaf M Dekkers; S W M Dieben; Johannes A Romijn; Frans M Helmerhorst
PCOS, coronary heart disease, stroke and the influence of obesity: a systematic review and meta-analysis.
Human reproduction update 2011;17(4):495-500.
2011: Kirsten Dijkhuizen; Olaf M Dekkers; Cas A G Holleboom; Christianne J M De Groot; Bart W J Hellebrekers; Godelieve J J van Roosmalen; Catharina A H Janssen; Frans M Helmerhorst
Vaginal misoprostol prior to insertion of an intrauterine device: an RCT.
Human reproduction (Oxford, England) 2011;26(2):323-9.
2011: Marie-Louise van der Hoorn; Frans M Helmerhorst; Frans Claas; Sicco A Scherjon
Dizygotic twin pregnancy after transfer of one embryo.
Fertility and sterility 2011;95(2):805.e1-3.
2011: Huib A A M Van Vliet; Laureen M Lopez; Marjolein Raps; Frans M Helmerhorst
Quadriphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2011;(11):CD009038.
2011: Huib A A M Van Vliet; David A Grimes; Laureen M Lopez; Kenneth F Schulz; Frans M Helmerhorst
Triphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2011;(11):CD003553.
2011: Maria F Gallo; David A Grimes; Laureen M Lopez; Kenneth F Schulz; Frans M Helmerhorst
Combination contraceptives: effects on weight.
Cochrane database of systematic reviews (Online) 2011;(9):CD003987.
2011: Theresa A Lawrie; Frans M Helmerhorst; Nandita K Maitra; Regina Kulier; Kitty Bloemenkamp; Metin Gulmezoglu
Types of progestogens in combined oral contraception: effectiveness and side-effects.
Cochrane database of systematic reviews (Online) 2011;(5):CD004861.
2010: Astrid Van Hylckama Vlieg; Frans M Helmerhorst; Frits R Rosendaal
The risk of deep venous thrombosis associated with injectable depot-medroxyprogesterone acetate contraceptives or a levonorgestrel intrauterine device.
Arteriosclerosis, thrombosis, and vascular biology 2010;30(11):2297-300.
2010: Sverre C Christiansen; Willem M Lijfering; Frans M Helmerhorst; Frits R Rosendaal; suzanne cannegieter
Sex difference in risk of recurrent venous thrombosis and the risk profile for a second event.
Journal of thrombosis and haemostasis : JTH 2010;8(10):2159-68.
2009: H A A M Van Vliet; Svetlana N Tchaikovski; Frits R Rosendaal; Jan Rosing; Frans M Helmerhorst
The effect of the levonorgestrel-releasing intrauterine system on the resistance to activated protein C (APC).
Thrombosis and haemostasis 2009;101(4):691-5.
2009: Astrid Van Hylckama Vlieg; Frans M Helmerhorst; Jan P Vandenbroucke; C J M Doggen; Frits R Rosendaal
The venous thrombotic risk of oral contraceptives, effects of oestrogen dose and progestogen type: results of the MEGA case-control study.
BMJ (Clinical research ed.) 2009;339():b2921.
2009: Laureen M Lopez; Ad Kaptein; Frans M Helmerhorst
Oral contraceptives containing drospirenone for premenstrual syndrome.
Cochrane database of systematic reviews (Online) 2009;(2):CD006586.
2008: Margreet Plaisier; E Streefland; PIETER KOOLWIJK; Victor W M van Hinsbergh; Frans M Helmerhorst; J J H M Erwich
Angiogenic growth factors and their receptors in first-trimester human decidua of pregnancies further complicated by preeclampsia or fetal growth restriction.
Reproductive sciences (Thousand Oaks, Calif.) 2008;15(7):720-6.
2008: Marjolein Knoester; Frans M Helmerhorst; Jan P Vandenbroucke; Lucette van der Westerlaken; Frans J Walther; Sylvia Veen
Cognitive development of singletons born after intracytoplasmic sperm injection compared with in vitro fertilization and natural conception.
Fertility and sterility 2008;90(2):289-96.
2008: Paul A O'Brien; Regina Kulier; Frans M Helmerhorst; Margaret Usher-Patel; Catherine d'Arcangues
Copper-containing, framed intrauterine devices for contraception: a systematic review of randomized controlled trials.
Contraception 2008;77(5):318-27.
2008: Marjolein Knoester; Frans M Helmerhorst; Jan P Vandenbroucke; Lucette van der Westerlaken; Frans J Walther; Sylvia Veen
Perinatal outcome, health, growth, and medical care utilization of 5- to 8-year-old intracytoplasmic sperm injection singletons.
Fertility and sterility 2008;89(5):1133-46.
2008: Kitty Kapiteijn; Robin M F van der Weiden; Frans M Helmerhorst
Injection of embryo culture supernatant prior to blastocyst transfer--cofactor?
Fertility and sterility 2008;89(4):1027-8; author reply 1028.
2008: H A A M Van Vliet; Rogier M Bertina; Anders Dahm; Frits R Rosendaal; Jan Rosing; Per Morten Sandset; Frans M Helmerhorst
Different effects of oral contraceptives containing different progestogens on protein S and tissue factor pathway inhibitor.
Journal of thrombosis and haemostasis : JTH 2008;6(2):346-51.
2008: Maria F Gallo; Laureen M Lopez; David Grimes; Kenneth F Schulz; Frans M Helmerhorst
Combination contraceptives: effects on weight.
Cochrane database of systematic reviews (Online) 2008;(4):CD003987.
2008: Margreet Plaisier; PIETER KOOLWIJK; Florian Willems; Frans M Helmerhorst; Victor W M van Hinsbergh
Pericellular-acting proteases in human first trimester decidua.
Molecular human reproduction 2008;14(1):41-51.
2008: H A A M Van Vliet; Sharon P Rodrigues; Marieke N E Snieders; Felix J M van der Meer; Marijke Frolich; Frits R Rosendaal; Jan Rosing; Frans M Helmerhorst
Sensitivity to activated protein C during the menstrual cycle in women with and without factor VLeiden.
Thrombosis research 2008;121(6):757-61.
2007: Svetlana N Tchaikovski; H A A M Van Vliet; M C L G D Thomassen; Rogier M Bertina; Frits R Rosendaal; Per Morten Sandset; Frans M Helmerhorst; Guido Tans; Jan Rosing
Effect of oral contraceptives on thrombin generation measured via calibrated automated thrombography.
Thrombosis and haemostasis 2007;98(6):1350-6.
2007: Marjolein Knoester; Frans M Helmerhorst; Lucette van der Westerlaken; Frans J Walther; Sylvia Veen
Matched follow-up study of 5 8-year-old ICSI singletons: child behaviour, parenting stress and child (health-related) quality of life.
Human reproduction (Oxford, England) 2007;22(12):3098-107.
2007: Margreet Plaisier; Sharon Rodrigues; Florian Willems; PIETER KOOLWIJK; Victor W M van Hinsbergh; Frans M Helmerhorst
Different degrees of vascularization and their relationship to the expression of vascular endothelial growth factor, placental growth factor, angiopoietins, and their receptors in first-trimester decidual tissues.
Fertility and sterility 2007;88(1):176-87.
2007: Denise A M Perquin; Matthias F C Beersma; Anton J M de Craen; Frans M Helmerhorst
The value of Chlamydia trachomatis-specific IgG antibody testing and hysterosalpingography for predicting tubal pathology and occurrence of pregnancy.
Fertility and sterility 2007;88(1):224-6.
2007: Marjolein Knoester; Jan P Vandenbroucke; Frans M Helmerhorst; Lucette van der Westerlaken; Frans J Walther; Sylvia Veen
Matched follow-up study of 5-8 year old ICSI-singletons: comparison of their neuromotor development to IVF and naturally conceived singletons.
Human reproduction (Oxford, England) 2007;22(6):1638-46.
2007: Rosana M Sibug; N Datson; A M I Tijssen; M Morsink; J de Koning; Ron de Kloet; Frans M Helmerhorst
Effects of urinary and recombinant gonadotrophins on gene expression profiles during the murine peri-implantation period.
Human reproduction (Oxford, England) 2007;22(1):75-82.
2006: FM van Dunné; Anton J M de Craen; Frans M Helmerhorst; Tom W J Huizinga; Rudi G J Westendorp
Interleukin-10 promoter polymorphisms in male and female fertility and fecundity.
Genes and immunity 2006;7(8):688-92.
2006: Kitty Kapiteijn; C S de Bruijn; E de Boer; Anton J M de Craen; Curt W Burger; Flora E van Leeuwen; Frans M Helmerhorst
Does subfertility explain the risk of poor perinatal outcome after IVF and ovarian hyperstimulation?
Human reproduction (Oxford, England) 2006;21(12):3228-34.
2006: Frans M Helmerhorst; Toni Belfield; Regina Kulier; Nandita Maitra; Paul O'Brien; David Grimes
The Cochrane Fertility Regulation Group: synthesizing the best evidence about family planning.
Contraception 2006;74(4):280-6.
2006: Bea C Tanis; Ale Algra; Yolanda van der Graaf; Frans M Helmerhorst; Frits Rosendaal
Procoagulant factors and the risk of myocardial infarction in young women.
European journal of haematology 2006;77(1):67-73.
2006: Frans M Helmerhorst; H A A M Van Vliet; Twina Gornas; Martijn J J Finken; David Grimes
Intrauterine insemination versus timed intercourse for cervical hostility in subfertile couples.
Obstetrical & gynecological survey 2006;61(6):402-14; quiz 423.
2006: Denise A M Perquin; P Joep Dörr; Anton J M de Craen; Frans M Helmerhorst
Routine use of hysterosalpingography prior to laparoscopy in the fertility workup: a multicentre randomized controlled trial.
Human reproduction (Oxford, England) 2006;21(5):1227-31.
2006: Kitty Kapiteijn; PIETER KOOLWIJK; Robin M F van der Weiden; Geerten P van Nieuw Amerongen; Margreet Plaisier; Victor W M van Hinsbergh; Frans M Helmerhorst
Human embryo-conditioned medium stimulates in vitro endometrial angiogenesis.
Fertility and sterility 2006;85 Suppl 1():1232-9.
2006: FM van Dunné; Anton J M de Craen; Bas Heijmans; Frans M Helmerhorst; Rudi G J Westendorp
Gender-specific association of the factor V Leiden mutation with fertility and fecundity in a historic cohort. The Leiden 85-Plus Study.
Human reproduction (Oxford, England) 2006;21(4):967-71.
2006: Lucette van der Westerlaken; Nico Naaktgeboren; Harjo Verburg; Sandra Dieben; Frans M Helmerhorst
Conventional in vitro fertilization versus intracytoplasmic sperm injection in patients with borderline semen: a randomized study using sibling oocytes.
Fertility and sterility 2006;85(2):395-400.
2006: H A A M Van Vliet; David Grimes; L M Lopez; Kenneth F Schulz; Frans M Helmerhorst
Triphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2006;(3):CD003553.
2006: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; Kenneth F Schulz
Biphasic versus triphasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2006;(3):CD003283.
2006: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; Kenneth F Schulz
Biphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2006;(3):CD002032.
2006: Denise A M Perquin; Anton J M de Craen; Frans M Helmerhorst
Difficulties in recruitment for a randomized controlled trial involving hysterosalpingography.
Reproductive health 2006;3():5.
2006: Margreet Plaisier; PIETER KOOLWIJK; roeland hanemaaijer; Robert A Verwey; Robin M F van der Weiden; Elle K J Risse; Clarissa Jungerius; Frans M Helmerhorst; Victor W M van Hinsbergh
Membrane-type matrix metalloproteinases and vascularization in human endometrium during the menstrual cycle.
Molecular human reproduction 2006;12(1):11-8.
2005: A J M Schreijer; suzanne cannegieter; Frits R Rosendaal; Frans M Helmerhorst
A case of thrombosis at high altitude.
Thrombosis and haemostasis 2005;94(5):1104-5.
2005: Ron de Kloet; Rosana M Sibug; Frans M Helmerhorst; Mathias V Schmidt; Mathias Schmidt
Stress, genes and the mechanism of programming the brain for later life.
Neuroscience and biobehavioral reviews 2005;29(2):271-81.
2005: Lucette van der Westerlaken; Frans M Helmerhorst; Sandra Dieben; Nico Naaktgeboren
Intracytoplasmic sperm injection as a treatment for unexplained total fertilization failure or low fertilization after conventional in vitro fertilization.
Fertility and sterility 2005;83(3):612-7.
2005: Anton J M de Craen; H A A M Van Vliet; Frans M Helmerhorst
An analysis of systematic reviews indicated low incorpororation of results from clinical trial quality assessment.
Journal of clinical epidemiology 2005;58(3):311-3.
2005: A Brewaeys; J K de Bruyn; L A Louwe; Frans M Helmerhorst
Anonymous or identity-registered sperm donors? A study of Dutch recipients' choices.
Human reproduction (Oxford, England) 2005;20(3):820-4.
2005: FM van Dunné; C J M Doggen; Mirjam H M Heemskerk; Frits R Rosendaal; Frans M Helmerhorst
Factor V Leiden mutation in relation to fecundity and miscarriage in women with venous thrombosis.
Human reproduction (Oxford, England) 2005;20(3):802-6.
2005: Rosana M Sibug; J de Koning; A M I Tijssen; Marco C De Ruiter; Ron de Kloet; Frans M Helmerhorst
Urinary gonadotrophins but not recombinant gonadotrophins reduce expression of VEGF120 and its receptors flt-1 and flk-1 in the mouse uterus during the peri-implantation period.
Human reproduction (Oxford, England) 2005;20(3):649-56.
2005: H A A M Van Vliet; Marijke Frolich; M Christella; L G D Thomassen; C J M Doggen; Frits R Rosendaal; Jan Rosing; Frans M Helmerhorst
Association between sex hormone-binding globulin levels and activated protein C resistance in explaining the risk of thrombosis in users of oral contraceptives containing different progestogens.
Human reproduction (Oxford, England) 2005;20(2):563-8.
2005: Frans M Helmerhorst; H A A M Van Vliet; T Gornas; Martijn J J Finken; David Grimes
Intra-uterine insemination versus timed intercourse for cervical hostility in subfertile couples.
Cochrane database of systematic reviews (Online) 2005;(4):CD002809.
2004: Margreet Plaisier; Kitty Kapiteijn; PIETER KOOLWIJK; Catherine Fijten; roeland hanemaaijer; Jos M Grimbergen; Adri A Mulder-Stapel; Paul H A Quax; Frans M Helmerhorst; Victor W M van Hinsbergh
Involvement of membrane-type matrix metalloproteinases (MT-MMPs) in capillary tube formation by human endometrial microvascular endothelial cells: role of MT3-MMP.
The Journal of clinical endocrinology and metabolism 2004;89(11):5828-36.
2004: FM van Dunné; Leroy R Lard; D Rook; Frans M Helmerhorst; Tom W J Huizinga
Miscarriage but not fecundity is associated with progression of joint destruction in rheumatoid arthritis.
Annals of the rheumatic diseases 2004;63(8):956-60.
2004: Robin M F van der Weiden; Frans M Helmerhorst
Prostacyclin/thromboxane early changes in pregnancies that are complicated by preeclampsia.
American journal of obstetrics and gynecology 2004;190(4):1168; author reply 1168-9.
2004: Eveline W C M Van Dam; Ferdinand Roelfsema; Johannes D Veldhuis; Simone Hogendoorn; Jos J M Westenberg; Frans M Helmerhorst; Marijke Frölich; H Michiel J Krans; A Edo Meinders; Hanno Pijl
Retention of estradiol negative feedback relationship to LH predicts ovulation in response to caloric restriction and weight loss in obese patients with polycystic ovary syndrome.
American journal of physiology. Endocrinology and metabolism 2004;286(4):E615-20.
2004: Frans M Helmerhorst; Denise A M Perquin; Diane Donker; Marc J N C Keirse
Perinatal outcome of singletons and twins after assisted conception: a systematic review of controlled studies.
BMJ (Clinical research ed.) 2004;328(7434):261.
2004: N Maitra; Regina Kulier; Kitty W M Bloemenkamp; Frans M Helmerhorst; Metin Gulmezoglu
Progestogens in combined oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2004;(3):CD004861.
2004: R French; H A A M Van Vliet; Frances M Cowan; DJ Mansour; S Morris; D Hughes; A Robinson; T Proctor; C Summerbell; Stuart Logan; Frans M Helmerhorst; John Guillebaud
Hormonally impregnated intrauterine systems (IUSs) versus other forms of reversible contraceptives as effective methods of preventing pregnancy.
Cochrane database of systematic reviews (Online) 2004;(3):CD001776.
2003: Lucette van der Westerlaken; Frans M Helmerhorst; Harjo Verburg; Nico Naaktgeboren
Successful intracytoplasmic sperm injection after failed in vitro fertilization due to multipronuclear oocytes.
Fertility and sterility 2003;80(3):639-40.
2003: Frits R Rosendaal; Astrid Van Hylckama Vlieg; Bea C Tanis; Frans M Helmerhorst
Estrogens, progestogens and thrombosis.
Journal of thrombosis and haemostasis : JTH 2003;1(7):1371-80.
2003: Kitty W M Bloemenkamp; Frans M Helmerhorst; Frits R Rosendaal; Jan P Vandenbroucke
Thrombophilias and gynaecology.
Best practice & research. Clinical obstetrics & gynaecology 2003;17(3):509-28.
2003: Maurice A A J van den Bosch; Jeanet M Kemmeren; Bea C Tanis; W P Th M Mali; Frans M Helmerhorst; Frits R Rosendaal; Ale Algra; Yolanda van der Graaf
The RATIO study: oral contraceptives and the risk of peripheral arterial disease in young women.
Journal of thrombosis and haemostasis : JTH 2003;1(3):439-44.
2003: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; Kenneth F Schulz
Biphasic versus triphasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2003;(2):CD003283.
2003: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; Kenneth F Schulz
Biphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2003;(2):CD002032.
2002: Rosana M Sibug; Frans M Helmerhorst; A M I Tijssen; Ron de Kloet; J de Koning
Estrogen reduces vascular endothelial growth factor(164) expression in the mouse nucleus paraventricularis of the hypothalamus.
Neuroscience letters 2002;333(3):199-202.
2002: Cornelis Kluft; J A Gevers Leuven; Frans M Helmerhorst; H Michiel J Krans
Pro-inflammatory effects of oestrogens during use of oral contraceptives and hormone replacement treatment.
Vascular pharmacology 2002;39(3):149-54.
2002: Kitty W M Bloemenkamp; Moniek P M de Maat; Marianne C Dersjant-Roorda; Frans M Helmerhorst; Cornelis Kluft
Genetic polymorphisms modify the response of factor VII to oral contraceptive use: an example of gene-environment interaction.
Vascular pharmacology 2002;39(3):131-6.
2002: Rosana M Sibug; Frans M Helmerhorst; A M I Tijssen; Ron de Kloet; J de Koning
Gonadotrophin stimulation reduces VEGF(120) expression in the mouse uterus during the peri-implantation period.
Human reproduction (Oxford, England) 2002;17(6):1643-8.
2002: Jeanet M Kemmeren; Bea C Tanis; Maurice A A J van den Bosch; E L E M Bollen; Frans M Helmerhorst; Yolanda van der Graaf; Frits R Rosendaal; Ale Algra
Risk of Arterial Thrombosis in Relation to Oral Contraceptives (RATIO) study: oral contraceptives and the risk of ischemic stroke.
Stroke; a journal of cerebral circulation 2002;33(5):1202-8.
2002: Eveline W C M Van Dam; Ferdinand Roelfsema; Johannes D Veldhuis; Frans M Helmerhorst; Marijke Frölich; A Edo Meinders; H Michiel J Krans; Hanno Pijl
Increase in daily LH secretion in response to short-term calorie restriction in obese women with PCOS.
American journal of physiology. Endocrinology and metabolism 2002;282(4):E865-72.
2002: Frits R Rosendaal; M Vessey; A Rumley; E Daly; Mark Woodward; Frans M Helmerhorst; Gordon D O Lowe
Hormonal replacement therapy, prothrombotic mutations and the risk of venous thrombosis.
British journal of haematology 2002;116(4):851-4.
2002: Frits R Rosendaal; Frans M Helmerhorst; Jan P Vandenbroucke
Female hormones and thrombosis.
Arteriosclerosis, thrombosis, and vascular biology 2002;22(2):201-10.
2001: Bea C Tanis; Maurice A A J van den Bosch; Jeanet M Kemmeren; VM Cats; Frans M Helmerhorst; Ale Algra; Yolanda van der Graaf; Frits R Rosendaal
Oral contraceptives and the risk of myocardial infarction.
The New England journal of medicine 2001;345(25):1787-93.
2001: Kitty Kapiteijn; PIETER KOOLWIJK; Robin M F van der Weiden; Frans M Helmerhorst; Teake Kooistra; Victor W M van Hinsbergh
Steroids and cytokines in endometrial angiogenesis.
Anticancer research 2001;21(6B):4231-42.
2001: Frits R Rosendaal; Frans M Helmerhorst; Jan P Vandenbroucke
Oral contraceptives, hormone replacement therapy and thrombosis.
Thrombosis and haemostasis 2001;86(1):112-23.
2001: PIETER KOOLWIJK; Kitty Kapiteijn; B Molenaar; E van Spronsen; Bea van der Vecht; Frans M Helmerhorst; Victor W M van Hinsbergh
Enhanced angiogenic capacity and urokinase-type plasminogen activator expression by endothelial cells isolated from human endometrium.
The Journal of clinical endocrinology and metabolism 2001;86(7):3359-67.
2001: Lucette van der Westerlaken; Harjo Verburg; Nico Naaktgeboren; Martijn H Breuning; Frans M Helmerhorst
Invasive prenatal diagnosis after intracytoplasmic sperm injection.
Fertility and sterility 2001;75(6):1240-1.
2001: Jan P Vandenbroucke; Jan Rosing; Kitty W M Bloemenkamp; Saskia Middeldorp; Frans M Helmerhorst; Bonno N Bouma; Frits R Rosendaal
Oral contraceptives and the risk of venous thrombosis.
The New England journal of medicine 2001;344(20):1527-35.
2001: S Guid Oei; Frans M Helmerhorst; MJ Keirse
Routine postcoital testing is unnecessary.
Human reproduction (Oxford, England) 2001;16(5):1051-3.
2001: Kitty W M Bloemenkamp; Christianne J M De Groot; H D Ronde; Ella J Duvekot; Frans M Helmerhorst; Rogier M Bertina
The effect of factor V Leiden, oral contraceptive use, type of oral contraceptives and pregnancy on APC-r levels in women with or without a history of pre-eclampsia.
European journal of obstetrics, gynecology, and reproductive biology 2001;95(2):225.
2001: J de Koning; Cornelis B Lambalk; Frans M Helmerhorst; MN Helder
Is GnRH self-priming an obligatory feature of the reproductive cycle?
Human reproduction (Oxford, England) 2001;16(2):209-14.
2001: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; K Schulz
Biphasic versus triphasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2001;(4):CD003283.
2001: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; K Schulz
Biphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2001;(4):CD002032.
2001: H A A M Van Vliet; David Grimes; Frans M Helmerhorst; K Schulz
Biphasic versus monophasic oral contraceptives for contraception.
Cochrane database of systematic reviews (Online) 2001;(2):CD002032.
2000: YJ Janssen; Frans M Helmerhorst; Marijke Frölich; Ferdinand Roelfsema
A switch from oral (2 mg/day) to transdermal (50 microg/day) 17beta-estradiol therapy increases serum insulin-like growth factor-I levels in recombinant human growth hormone (GH)-substituted women with GH deficiency.
The Journal of clinical endocrinology and metabolism 2000;85(1):464-7.
1999: Kitty W M Bloemenkamp; F R Rosendaal; Frans M Helmerhorst; J P Vandenbroucke
Venous thromboembolism and oral contraceptives.
Lancet 1999;354(9188):1469; author reply 1469-70.
1999: Lucette van der Westerlaken; Frans M Helmerhorst; J Hermans; Nico Naaktgeboren
Intracytoplasmic sperm injection: position of the polar body affects pregnancy rate.
Human reproduction (Oxford, England) 1999;14(10):2565-9.
1999: Christianne J M De Groot; Kitty W M Bloemenkamp; Ella J Duvekot; Frans M Helmerhorst; Rogier M Bertina; Felix J M van der Meer; H de Ronde; S Guid Oei; Humphrey H H Kanhai; Frits R Rosendaal
Preeclampsia and genetic risk factors for thrombosis: a case-control study.
American journal of obstetrics and gynecology 1999;181(4):975-80.
1999: Kitty W M Bloemenkamp; Frans M Helmerhorst; Frits R Rosendaal; Jan P Vandenbroucke
Venous thrombosis, oral contraceptives and high factor VIII levels.
Thrombosis and haemostasis 1999;82(3):1024-7.
1999: Frans M Helmerhorst; Martijn J J Finken; J J Erwich
Antisperm antibodies: detection assays for antisperm antibodies: what do they test?
Human reproduction (Oxford, England) 1999;14(7):1669-71.
1998: Frans M Helmerhorst; Frits R Rosendaal; Jan P Vandenbroucke
Venous thromboembolism and the pill. The WHO technical report on cardiovascular disease and steroid hormone contraception: state-of-the-art. World Health Organization.
Human reproduction (Oxford, England) 1998;13(11):2981-3.
1998: Kitty W M Bloemenkamp; Frits R Rosendaal; Frans M Helmerhorst; T Koster; R M Bertina; Jan P Vandenbroucke
Hemostatic effects of oral contraceptives in women who developed deep-vein thrombosis while using oral contraceptives.
Thrombosis and haemostasis 1998;80(3):382-7.
1998: S Guid Oei; Frans M Helmerhorst; Kitty W M Bloemenkamp; F A Hollants; D E Meerpoel; MJ Keirse
Effectiveness of the postcoital test: randomised controlled trial.
BMJ (Clinical research ed.) 1998;317(7157):502-5.
1998: Lucette van der Westerlaken; Nico Naaktgeboren; Frans M Helmerhorst
Evaluation of pregnancy rates after intrauterine insemination according to indication, age, and sperm parameters.
Journal of assisted reproduction and genetics 1998;15(6):359-64.
1998: Frans M Helmerhorst; Frits R Rosendaal; Jan P Vandenbroucke
The pill and venous thromboembolism: a disarray of several layers of debate.
Human reproduction (Oxford, England) 1998;13(5):1119-20.
1998: R M van der Weiden; Frans M Helmerhorst; Marc J N C Keirse
Which prostanoid metabolites should be determined for the study of reproductive processes?
Prostaglandins, leukotrienes, and essential fatty acids 1998;58(3):205-7.
1997: Frans M Helmerhorst; Kitty W M Bloemenkamp; Frits R Rosendaal; Jan P Vandenbroucke
Oral contraceptives and thrombotic disease: risk of venous thromboembolism.
Thrombosis and haemostasis 1997;78(1):327-33.
1997: S Guid Oei; Frans M Helmerhorst; Kitty W M Bloemenkamp; M Dersjant-Roorda; MJ Keirse
Predicting optimal cervical mucus for infertility diagnosis.
European journal of obstetrics, gynecology, and reproductive biology 1997;73(1):63-6.
1997: J P Vandenbroucke; Frans M Helmerhorst; Kitty W M Bloemenkamp; F R Rosendaal
Third-generation oral contraceptives and venous thrombosis.
Lancet 1997;349(9053):731; author reply 732-3.
1997: J P Vandenbroucke; Kitty W M Bloemenkamp; Frans M Helmerhorst; F R Rosendaal
Risk of oral contraceptives and recency of market introduction.
Contraception 1997;55(3):191-2; discussion 192-4.
1996: J P Vandenbroucke; Kitty W M Bloemenkamp; Frans M Helmerhorst; F R Rosendaal
Mortality from venous thromboembolism and myocardial infarction in young women in the Netherlands.
Lancet 1996;348(9024):401-2.
1996: R M van der Weiden; Lambertus J Wisse; Frans M Helmerhorst; Marc J N C Keirse; R E Poelmann
Immunohistochemical and ultrastructural localization of prostaglandin H synthase in the preimplantation mouse embryo.
Journal of reproduction and fertility 1996;107(2):161-6.
1996: R M van der Weiden; Frans M Helmerhorst; Marc J N C Keirse
Prostanoid excretion in incipient singleton and twin pregnancies.
American journal of obstetrics and gynecology 1996;174(5):1614-7.
1996: S Guid Oei; Frans M Helmerhorst; Kitty W M Bloemenkamp; Marc J N C Keirse
Effect of the postcoital test on the sexual relationship of infertile couples: a randomized controlled trial.
Fertility and sterility 1996;65(4):771-5.
1996: S Guid Oei; Kitty W M Bloemenkamp; Frans M Helmerhorst; Nico Naaktgeboren; Marc J N C Keirse
Evaluation of the postcoital test for assessment of 'cervical factor' infertility.
European journal of obstetrics, gynecology, and reproductive biology 1996;64(2):217-20.
1995: Kitty W M Bloemenkamp; F R Rosendaal; Frans M Helmerhorst; H R Büller; J P Vandenbroucke
Enhancement by factor V Leiden mutation of risk of deep-vein thrombosis associated with oral contraceptives containing a third-generation progestagen.
Lancet 1995;346(8990):1593-6.
1995: R M van der Weiden; Frans M Helmerhorst; Marc J N C Keirse
Prostanoid excretion before in vitro fertilization relates to the likelihood of pregnancy.
Prostaglandins, leukotrienes, and essential fatty acids 1995;53(6):419-21.
1995: Frans M Helmerhorst; S Guid Oei; Kitty W M Bloemenkamp; Marc J N C Keirse
[Variations in fertility studies in The Netherlands].
Nederlands tijdschrift voor geneeskunde 1995;139(41):2088-91.
1995: A Brewaeys; P Devroey; Frans M Helmerhorst; E V Van Hall; I Ponjaert
Lesbian mothers who conceived after donor insemination: a follow-up study.
Human reproduction (Oxford, England) 1995;10(10):2731-5.
1995: Frans M Helmerhorst; S Guid Oei; Kitty W M Bloemenkamp; Marc J N C Keirse
Consistency and variation in fertility investigations in Europe.
Human reproduction (Oxford, England) 1995;10(8):2027-30.
1995: S Guid Oei; Marc J N C Keirse; Kitty W M Bloemenkamp; Frans M Helmerhorst
European postcoital tests: opinions and practice.
British journal of obstetrics and gynaecology 1995;102(8):621-4.
1995: S Guid Oei; Frans M Helmerhorst; Marc J N C Keirse
When is the post-coital test normal? A critical appraisal.
Human reproduction (Oxford, England) 1995;10(7):1711-4.
1995: T Koster; R A Small; F R Rosendaal; Frans M Helmerhorst
Oral contraceptives and venous thromboembolism: a quantitative discussion of the uncertainties.
Journal of internal medicine 1995;238(1):31-7.
1995: I Heijnsbroek; Frans M Helmerhorst; A F van den Berg-Helder; K J van der Zwan; Nico Naaktgeboren; Marc J N C Keirse
Follow-up of 30 pregnancies after embryo cryopreservation.
European journal of obstetrics, gynecology, and reproductive biology 1995;59(2):201-4.
1995: S Guid Oei; J Derksen; J J Weusten; E G Lentjes; Frans M Helmerhorst
A case of 16-ene-synthetase deficiency in male pseudohermaphroditism due to combined 17 alpha-hydroxylase/17,20-lyase deficiency.
European journal of endocrinology / European Federation of Endocrine Societies 1995;132(3):281-5.
1994: R M van der Weiden; W A Noort; Nico Naaktgeboren; Frans M Helmerhorst; Marc J N C Keirse
Prostanoid levels in in vitro fertilization culture medium are not related to the likelihood of implantation.
Fertility and sterility 1994;62(6):1217-20.
1993: R M van der Weiden; R M Verdijk; R E Poelmann; Frans M Helmerhorst; Marc J N C Keirse
The influence of indomethacin on the hatching of mouse blastocysts.
Prostaglandins, leukotrienes, and essential fatty acids 1993;49(3):683-6.
1991: R M van der Weiden; Frans M Helmerhorst; Marc J N C Keirse
Influence of prostaglandins and platelet activating factor on implantation.
Human reproduction (Oxford, England) 1991;6(3):436-42.
1990: A B van de-Helder; Frans M Helmerhorst; A Blankhart; R Brand; C Waegemaekers; Nico Naaktgeboren
Comparison of ovarian stimulation regimens for in vitro fertilization (IVE) with and without a gonadotropin-releasing hormone (GnRH) agonist: results of a randomized study.
Journal of in vitro fertilization and embryo transfer : IVF 1990;7(6):358-62; discussion 363-4.
1990: Nico W E Schuitemaker; Frans M Helmerhorst; R T Tjon A Tham; J L van Saase
Late anaphylactic shock after hysterosalpingography.
Fertility and sterility 1990;54(3):535-6.
1989: R M van der Weiden; Frans M Helmerhorst
Suppression of gonadotrophin secretion does not reverse premature ovarian failure.
British journal of obstetrics and gynaecology 1989;96(7):881.
1987: C T Waegemaekers; A van de Berg; A Blankhart; Frans M Helmerhorst; Nico Naaktgeboren
Ovarian cyst formation during the use of a GnRH analogue in an IVF programme.
Acta Europaea fertilitatis 1987;18(6):411.
1987: Nico Naaktgeboren; A Van Den Berg-Helder; A Blankhart; E Mendels; T Trimbos-Kemper; C Waegemaekers; E V Van Hall; Frans M Helmerhorst
In vitro fertilization at the Leiden Academic Hospital. Initial experiences.
Acta Europaea fertilitatis 1987;18(3):181-3.