1Department of Obstetrics and Gynecology, Radboud University Medical Center, Nijmegen, Netherlands
2Department of Obstetrics and Gynecology, Rijnstate Hospital, Arnhem, Netherlands
3Department of Obstetrics and Gynecology, Canisius-Wilhelmina Hospital, Nijmegen, Netherlands
4Department of Obstetrics and Gynecology, Gelderse Vallei Hospital, Ede, Netherlands
5Department of Obstetrics and Gynecology, Bernhoven Hospital, Uden, Netherlands