1. The Society for the Investigation of Early Pregnancy New York NY USA
2. Department of Obstetrics and Gynecology University of North Carolina Chapel Hill NC USA
3. Department of Obstetrics and Gynecology Stellenbosch University Stellenbosch South Africa
4. Center of Obstetrics and Gynecology Vilnius University Medical Faculty Vilnius Lithuania
5. The New European Surgical Academy The Charite University Hospital Berlin Germany
6. Department of Obstetrics and Gynecology St Mary Hospital Waterbury CT USA
7. Department of Obstetrics and Gynecology American University of Beirut Medical Center Beirut Lebanon