Affiliation: | 1. Department of Obstetrics and Gynecology, Isala, PO Box 10500, 8000 GK, Zwolle, The Netherlands 2. Department of Obstetrics and Gynecology, Kennemer Gasthuis, Haarlem, The Netherlands 3. Department of Obstetrics and Gynecology, Máxima Medisch Centrum, Veldhoven, The Netherlands 4. Department of Obstetrics and Gynecology, Jeroen Bosch Ziekenhuis, Den Bosch, The Netherlands
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