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Fertilizations in Vitro
Twins
Newborn Infant
Pregnancy
Pregnancy, Multiple
Gestational Age
Birth Weight
Denmark
Intracytoplasmic Sperm Injections
Embryo Transfer
Assisted Reproductive Techniques
Cohort Studies
Pregnancy Outcomes
Risk Factors
Infant Mortality
Registries
Maternal Age
Pregnancy Rates
Diseases in Twins
Infertility
Co-Publications
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