1. University Medical Center Utrecht; Obstetrics and Gynaecology; Jan van Scorelstraat 157 Utrecht Netherlands 3583 CN
2. University of Amsterdam; Department of Obstetrics & Gynaecology Academic Medical Centre; 1100 DD Amsterdam PO BOX 22660 Amsterdam Netherlands 1100
3. Isala Clinics, Location Sophia; Department of Obstetrics & Gynaecology; Dr van Heesweg 2 P O Box 10400 Zwolle Netherlands 3515 BE
4. University of Auckland; Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003