1. Catharina Hospital; Department of Obstetrics and Gynecology; Michelangelolaan 2 Eindhoven Netherlands 5602ZA
2. Division of Reproductive Medicine; Department of Obstetrics & Gynaecology; Maastricht University Medical Center P.O. Box 5800 Maastricht Netherlands 6202 AZ
3. University of Auckland; Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003