1. Department of Obstetrics & Gynecology University Hospital Leuven Leuven Belgium
2. Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital Harvard Medical School Boston MA USA
3. Early Pregnancy and Acute Gynaecology Unit, Department of Obstetrics and Gynaecology Queen Charlotte's and Chelsea Hospital, Imperial College London London UK
4. Department of Obstetrics and Gynecology Amsterdam University Medical Center Amsterdam The Netherlands
5. Department of Development & Regeneration KU Leuven Leuven Belgium