Affiliation: | 1. Department of Obstetrics and Gynecology, VU University Medical Center, Amsterdam, The Netherlands;2. Department of Epidemiology & Biostatistics, VU University Medical Center, Amsterdam, The Netherlands;3. Department of Obstetrics and Gynecology, Radboud University Medical Center, Nijmegen, The Netherlands;4. Department of Obstetrics and Gynecology, Leiden University Medical Center, Leiden, The Netherlands |