1. Radboud University Medical Center; Department of Obstetrics and Gynaecology; PO Box 9101 Nijmegen Netherlands 6500 HB
2. Repromed; 105 Remuera Road Auckland New Zealand 1050
3. University of Auckland; Department of Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003
4. Radboud University Nijmegen Medical Center; Department of Obstetrics and Gynaecology; PO Box 9101 Nijmegen Netherlands 6500 HB
5. Sheffield Teaching Hospitals; The Jessop Wing and Royal Hallamshire Hospital; Sheffield UK S10 2JF