Affiliation: | 1. Department of Obstetrics and Gynecology, University Medical Centre Utrecht, Utrecht, The Netherlands;2. Department of Obstetrics and Gynecology, VU University Medical Center, Amsterdam, The Netherlands EJW and IHL contributed equally.;3. National Institute for Public Health and Environment, Bilthoven, The Netherlands;4. Department of Obstetrics and Gynecology, Medical College of Columbia University, New York, USA;5. Department of Clinical Chemistry, VU University Medical Center, Amsterdam, The Netherlands;6. Department of Obstetrics and Gynecology, VU University Medical Center, Amsterdam, The Netherlands |