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Liezl Koen

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Robin Emsley; Liezl Koen; Dana Niehaus; Petrus Oosthuizen; Lupe Martinez
Comparison of treatment response in second-episode versus first-episode schizophrenia.
Britt Drögemöller; Anke Dunaiski; Stefan Gebhardt; Liezl Koen; Lundi Korkie; Dana Niehaus; Antonel Olckers; Marieth Plummer; Nicol Schneider; Gloudi Agenbag; Galen Wright; Louise Warnich
Characterization of the genetic variation present in CYP3A4 in three South African populations.
Galen E B Wright; Britt I Drögemöller; Craig J Kinnear; Liezl Koen; Lundi J Korkie; Dana J H Niehaus; Lize van der Merwe; Louise Warnich
Association of MB-COMT polymorphisms with schizophrenia-susceptibility and symptom severity in an African cohort.

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All Publications

2013: Robin Emsley; Liezl Koen; Dana Niehaus; Petrus Oosthuizen; Lupe Martinez
Comparison of treatment response in second-episode versus first-episode schizophrenia.
Journal of clinical psychopharmacology 2013;33(1):80-3.
2013: Britt Drögemöller; Anke Dunaiski; Stefan Gebhardt; Liezl Koen; Lundi Korkie; Dana Niehaus; Antonel Olckers; Marieth Plummer; Nicol Schneider; Gloudi Agenbag; Galen Wright; Louise Warnich
Characterization of the genetic variation present in CYP3A4 in three South African populations.
Frontiers in genetics 2013;4():17.
2012: Galen E B Wright; Britt I Drögemöller; Craig J Kinnear; Liezl Koen; Lundi J Korkie; Dana J H Niehaus; Lize van der Merwe; Louise Warnich
Association of MB-COMT polymorphisms with schizophrenia-susceptibility and symptom severity in an African cohort.
Progress in neuro-psychopharmacology & biological psychiatry 2012;39(1):163-9.
2012: Robin Emsley; Liezl Koen; Dana J H Niehaus; Piet P Oosthuizen; Guadalupe Martinez
Symptom recurrence following intermittent treatment in first-episode schizophrenia successfully treated for 2 years: a 3-year open-label clinical study.
The Journal of clinical psychiatry 2012;73(4):e541-7.
2012: I Smit; Esme Renette Jordaan; Liezl Koen; Dana J H Niehaus; U A Botha
Neurological soft signs as an endophenotype in an African schizophrenia population - a pilot study.
African journal of psychiatry 2012;15(2):124-7.
2012: Dana J H Niehaus; M Mashile; Esme Renette Jordaan; Liezl Koen; S Mall
Applicability and fairness of the oral examination in undergraduate psychiatry training in South Africa.
African journal of psychiatry 2012;15(2):119-23.
2012: Liezl Koen; G de Jong; Robin A Emsley; Dana J H Niehaus; Louise Warnich; Galen Wright; Sumaya Mall
Chromosome 22q11 in a Xhosa schizophrenia population.
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2012;102(3 Pt 1):165-6.
2011: R Emsley; Liezl Koen; Dana J H Niehaus; Piet P Oosthuizen; B Chiliza; D Fincham
Subjective awareness of tardive dyskinesia and insight in schizophrenia.
European psychiatry : the journal of the Association of European Psychiatrists 2011;26(5):293-6.
2010: Britt I Drögemöller; Galen Wright; Dana J H Niehaus; Liezl Koen; Stefanie Malan; Danielle M Da Silva; Renate Hillermann-Rebello; Anthony M La Grange; Mauritz Venter; Louise Warnich
Characterization of the genetic profile of CYP2C19 in two South African populations.
Pharmacogenomics 2010;11(8):1095-103.
2010: Galen Wright; Dana J H Niehaus; Britt I Drögemöller; Liezl Koen; Andrea Gaedigk; Louise Warnich
Elucidation of CYP2D6 genetic diversity in a unique African population: implications for the future application of pharmacogenetics in the Xhosa population.
Annals of human genetics 2010;74(4):340-50.
2010: Ulla A Botha; Liezl Koen; John A Joska; John S Parker; Neil Horn; Linda M Hering; Piet P Oosthuizen
The revolving door phenomenon in psychiatry: comparing low-frequency and high-frequency users of psychiatric inpatient services in a developing country.
Social psychiatry and psychiatric epidemiology 2010;45(4):461-8.
2010: Crick Lund; Piet Oosthuizen; Alan J Flisher; Robin Emsley; Dan Stein; Ulla Botha; Liezl Koen; John Joska
Pathways to inpatient mental health care among people with schizophrenia spectrum disorders in South Africa.
Psychiatric services (Washington, D.C.) 2010;61(3):235-40.
2010: Ulla A Botha; Liezl Koen; John A Joska; Linda M Hering; Piet P Oosthuizen
Assessing the efficacy of a modified assertive community-based treatment programme in a developing country.
BMC psychiatry 2010;10():73.
2008: Robin Emsley; Dana J H Niehaus; Petrus P Oosthuizen; Liezl Koen; Brynne Ascott-Evans; Bonginkosi Chiliza; Susan J van Rensburg; Retha M Smit
Safety of the omega-3 fatty acid, eicosapentaenoic acid (EPA) in psychiatric patients: results from a randomized, placebo-controlled trial.
Psychiatry research 2008;161(3):284-91.
2008: Robin Emsley; Petrus Oosthuizen; Liezl Koen; Dana J H Niehaus; Rossella Medori; Jonathan Rabinowitz
Oral versus injectable antipsychotic treatment in early psychosis: post hoc comparison of two studies.
Clinical therapeutics 2008;30(12):2378-86.
2008: Liezl Koen; P Magni; D J Niehaus; A le Roux
Antipsychotic prescription patterns in Xhosa patients with schizophrenia or schizoaffective disorder.
African journal of psychiatry 2008;11(4):287-90.
2008: U Botha; Liezl Koen; Piet P Oosthuizen; John A Joska; L Hering
Assertive community treatment in the South African context.
African journal of psychiatry 2008;11(4):272-5.
2008: Piet P Oosthuizen; Robin Emsley; D Niehaus; Liezl Koen
The multidimensional assessment of psychopathology in mood and psychotic disorders. A proposal for Axis II in DSM-V/ICD-11.
African journal of psychiatry 2008;11(4):260-3.
2008: Jukka M Leppänen; Dana J H Niehaus; Liezl Koen; Renata Schoeman; Robin Emsley
Allocation of attention to the eye and mouth region of faces in schizophrenia patients.
Cognitive neuropsychiatry 2008;13(6):505-19.
2008: Robin Emsley; Petrus Oosthuizen; Liezl Koen; Dana J H Niehaus; Rossella Medori; Jonathan Rabinowitz
Remission in patients with first-episode schizophrenia receiving assured antipsychotic medication: a study with risperidone long-acting injection.
International clinical psychopharmacology 2008;23(6):325-31.
2008: Robin Emsley; Rossella Medori; Liezl Koen; Petrus Paulus Oosthuizen; Dana J H Niehaus; Jonathan Rabinowitz
Long-acting injectable risperidone in the treatment of subjects with recent-onset psychosis: a preliminary study.
Journal of clinical psychopharmacology 2008;28(2):210-3.
2008: Jonathan Rabinowitz; Stephen Levine; Rossella Medori; Petrus Oosthuizen; Liezl Koen; Robin Emsley
Concordance of patient and clinical ratings of symptom severity and change of psychotic illness.
Schizophrenia research 2008;100(1-3):359-60.
2008: Jukka M Leppänen; Dana J H Niehaus; Liezl Koen; Elsa Du Toit; Renata Schoeman; Robin Emsley
Deficits in facial affect recognition in unaffected siblings of Xhosa schizophrenia patients: evidence for a neurocognitive endophenotype.
Schizophrenia research 2008;99(1-3):270-3.
2008: Dana J H Niehaus; Stan A du Plessis; Liezl Koen; Barbara H Lategan; Janus Steyn; Piet P Oosthuizen; Louise Warnich; Robin Emsley
Predictors of abnormal involuntary movement in an african schizophrenia population.
The Journal of neuropsychiatry and clinical neurosciences 2008;20(3):317-26.
2008: Dana J H Niehaus; Liezl Koen; Ushma Galal; Khalid Dhansay; Piet P Oosthuizen; Robin Emsley; Esme Renette Jordaan
Crisis discharges and readmission risk in acute psychiatric male inpatients.
BMC psychiatry 2008;8():44.
2008: Jacqueline E Muller; Ignatius Wentzel; Liezl Koen; Dana J H Niehaus; Soraya Seedat; Dan Stein
Escitalopram in the treatment of multisomatoform disorder: a double-blind, placebo-controlled trial.
International clinical psychopharmacology 2008;23(1):43-8.
2007: Roselle le Roux; Dana J H Niehaus; Liezl Koen; Cathlene Seller; Christine Lochner; Robin Emsley
Initiation rites as a perceived stressor for Isixhosa males with schizophrenia.
Transcultural psychiatry 2007;44(2):292-9.
2007: Angelika Hitzeroth; Dana J H Niehaus; Liezl Koen; Willem C Botes; Jean-François Deleuze; Louise Warnich
Association between the MnSOD Ala-9Val polymorphism and development of schizophrenia and abnormal involuntary movements in the Xhosa population.
Progress in neuro-psychopharmacology & biological psychiatry 2007;31(3):664-72.
2007: Liezl Koen; Susan Uys; Dana J H Niehaus; Robin Emsley
Negative symptoms and HIV/AIDS risk-behavior knowledge in schizophrenia.
Psychosomatics 2007;48(2):128-34.
2007: Liezl Koen; S V Vuuren; Dana J H Niehaus; Robin Emsley
HIV/AIDS risk behaviour in South African schizophrenia patients.
West African journal of medicine 2007;26(1):2-6.
2006: Robin Emsley; Piet P Oosthuizen; Martin Kidd; Liezl Koen; Dana J H Niehaus; H Jadri Turner
Remission in first-episode psychosis: predictor variables and symptom improvement patterns.
The Journal of clinical psychiatry 2006;67(11):1707-12.
2006: Piet P Oosthuizen; Robin Emsley; Dana J H Niehaus; Liezl Koen; Bonga Chiliza
The relationships between depression and remission in first-episode psychosis.
World psychiatry : official journal of the World Psychiatric Association (WPA) 2006;5(3):172-6.
2006: Esme Renette Jordaan; Dana J H Niehaus; Liezl Koen; Cathlene Seller; Irene Mbanga; Robin Emsley
Season of birth, age and negative symptoms in a Xhosa schizophrenia sample from the Southern Hemisphere.
The Australian and New Zealand journal of psychiatry 2006;40(8):698-703.
2006: Ulla A Botha; Liezl Koen; Dana J H Niehaus
Perceptions of a South African schizophrenia population with regards to community attitudes towards their illness.
Social psychiatry and psychiatric epidemiology 2006;41(8):619-23.
2006: Jukka M Leppänen; Dana J H Niehaus; Liezl Koen; E Du Toit; R Schoeman; Robin Emsley
Emotional face processing deficit in schizophrenia: A replication study in a South African Xhosa population.
Schizophrenia research 2006;84(2-3):323-30.
2006: Robin Emsley; Dana J H Niehaus; Liezl Koen; Piet P Oosthuizen; H Jadri Turner; Paul Carey; Susan J van Rensburg; J Stephanus Maritz; Harald Murck
The effects of eicosapentaenoic acid in tardive dyskinesia: a randomized, placebo-controlled trial.
Schizophrenia research 2006;84(1):112-20.
2006: Liezl Koen; Dana J H Niehaus; Greetje De Jong; Jacqueline E Muller; Esme Renette Jordaan
Morphological features in a Xhosa schizophrenia population.
BMC psychiatry 2006;6():47.
2005: Dana J H Niehaus; Liezl Koen; Claudine Laurent; Jacqueline Muller; Jean-François Deleuze; Jacques Mallet; Cathlene Seller; Esme Renette Jordaan; Robin Emsley
Positive and negative symptoms in affected sib pairs with schizophrenia: implications for genetic studies in an African Xhosa sample.
Schizophrenia research 2005;79(2-3):239-49.
2005: Dana J H Niehaus; Dan Stein; Liezl Koen; Christine Lochner; Jacqueline E Muller; N Irene Mbanga; Robin Emsley; Jack M Gorman
A case of "ifufunyane": a xhosa culture-bound syndrome.
Journal of psychiatric practice 2005;11(6):411-3.
2005: Jacqueline E Muller; Liezl Koen; Dan Stein
Anxiety and medical disorders.
Current psychiatry reports 2005;7(4):245-51.
2005: Piet P Oosthuizen; Robin Emsley; Natasha Keyter; Dana J H Niehaus; Liezl Koen
Duration of untreated psychosis and outcome in first-episode psychosis. Perspective from a developing country.
Acta psychiatrica Scandinavica 2005;111(3):214-9.
2005: Dana J H Niehaus; Liezl Koen; Jacqueline Muller; Claudine Laurent; Dan Stein; Christine Lochner; Soraya Seedat; Irene Mbanga; Jean-François Deleuze; Jacques Mallet; Robin Emsley
Obsessive compulsive disorder--prevalence in Xhosa-speaking schizophrenia patients.
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2005;95(2):120-2.
2005: Jacqueline E Muller; Liezl Koen; Soraya Seedat; Dan Stein
Social anxiety disorder : current treatment recommendations.
CNS drugs 2005;19(5):377-91.
2004: Liezl Koen; B H Lategan; Esme Renette Jordaan; Dana J H Niehaus; Robin Emsley
Management of violent behaviour in acutely relapsed schizophrenics.
Curationis 2004;27(4):73-80.
2004: Jacqueline E Muller; Liezl Koen; Seedat Soraya; Robin Emsley; Dan Stein
Anxiety disorders and schizophrenia.
Current psychiatry reports 2004;6(4):255-61.
2004: Liezl Koen; Craig J Kinnear; Valerie A Corfield; Robin Emsley; Esme Renette Jordaan; Natasha Keyter; Johanna C Moolman-Smook; Dan Stein; Dana J H Niehaus
Violence in male patients with schizophrenia: risk markers in a South African population.
The Australian and New Zealand journal of psychiatry 2004;38(4):254-9.
2004: Dana J H Niehaus; Claudine Laurent; Esme Renette Jordaan; Liezl Koen; Piet P Oosthuizen; Natasha Keyter; Jacqueline E Muller; N Irene Mbanga; Jean-François Deleuze; Jacques Mallet; Dan Stein; Robin Emsley
Suicide attempts in an African schizophrenia population: an assessment of demographic risk factors.
Suicide & life-threatening behavior 2004;34(3):320-7.
2004: Sandra Brink; Dana J H Niehaus; Piet P Oosthuizen; Jacqueline Muller; Liezl Koen
Occupation and schizophrenia in a Xhosa population--a variant of the social drift theory?
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2004;94(1):42.
2003: Liezl Koen; Piet P Oosthuizen; Dana J H Niehaus; Robin Emsley; Jacqueline E Muller; Dan Stein; Natasha Keyter; Christine Lochner; Soraya Seedat
Prevalence of obsessive compulsive disorder in first- and multi-episode male patients with schizophrenia-spectrum disorders.
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2003;93(7):517-8.
2003: Liezl Koen; Dana J H Niehaus; Jacqueline Muller; Claudine Laurent
Use of traditional treatment methods in a Xhosa schizophrenia population.
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde 2003;93(6):443.