1. Cochrane Belgium; Academic Centre for General Practice; Kapucijnenvoer 33 blok J bus 7001 Leuven Belgium 3000
2. Ghent University Hospital; Women’s Clinic; Corneel Heymanslaan 10 Ghent Belgium 9000
3. University Hospital Ghent; Obstetrics and Gynaecology; De Pintelaan 185 Ghent Belgium
4. University Medical Center; Department of Reproductive Medicine and Gynecology; Heidelberglaan 100 Utrecht Netherlands 3584 CX
5. University Hospital Gasthuisberg; Leuven University Fertility Centre; Herestraat 49 Leuven Belgium 3000
6. Máxima Medisch Centrum; Department of Obstetrics and Gynaecology; Veldhoven Netherlands
7. Monash University; Department of Obstetrics and Gynaecology; 246 Clayton Road Clayton Victoria Australia 3168