1. University Hospital Münster; Department of Obstetrics and Gynaecology; Albert-Schweitzer-Campus 1 Münster Germany 48149
2. Radboud University Nijmegen Medical Center; Department of Obstetrics and Gynaecology; PO Box 9101 Nijmegen Netherlands 6500 HB
3. University of Auckland; Department of Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003