1. University Medical Centre; Department of Obstetrics & Gynaecology; Hanzeplein 1 Groningen Netherlands 9700 RB
2. Isala Clinics, Location Sophia; Department of Obstetrics & Gynaecology; Dr van Heesweg 2 P O Box 10400 Zwolle Netherlands 3515 BE
3. University of Amsterdam; Department of Obstetrics & Gynaecology Academic Medical Centre; 1100 DD Amsterdam PO BOX 22660 Amsterdam Netherlands 1100
4. University of Auckland; Obstetrics and Gynaecology; Park Rd Grafton Auckland New Zealand 1003