1. Cochrane Belgium; Academic Centre for General Practice; Kapucijnenvoer 33 blok J bus 7001 Leuven Belgium 3000
2. University Hospital Ghent; Obstetrics and Gynaecology; De Pintelaan 185 Ghent Belgium 9000
3. University Hospital Gasthuisberg; Leuven University Fertility Centre; Herestraat 49 Leuven Belgium 3000
4. University Medical Center; Department of Reproductive Medicine and Gynecology; Heidelberglaan 100 Utrecht Netherlands 3584 CX
5. The University of Adelaide; Adelaide Australia SA5005
6. The University of Adelaide; Discipline of Obstetrics and Gynaecology, School of Medicine, Robinson Research Institute; Level 3, Medical School South Building Frome Road Adelaide South Australia Australia SA 5005