| Affiliation: | 1. Department of Obstetrics and Gynecology, Medical Center, VU University, Amsterdam, The Netherlands;2. Medical Library, VU University, Amsterdam, The Netherlands;3. Department of Obstetrics and Gynecology, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands;4. Department of Obstetrics and Gynecology, Amsterdam Medical Center, Amsterdam, The Netherlands;5. Department of Obstetrics and Gynecology, Medical Center Haaglanden, the Hague, The Netherlands;6. Department of Obstetrics and Gynecology, University Medical Center Utrecht, Utrecht, The Netherlands;g Department of Obstetrics and Gynecology, Leiden University Medical Center, Leiden, The Netherlands |
