1. Unit of Reproductive Medicine, “Leto” Maternity Hospital, Athens, Greece;
2. 2nd Department of Obstetrics and Gynecology, “Aretaieion” University Hospital, Athens, Greece;
3. 1st Department of Obstetrics and Gynecology, “Alexandra” University Hospital, Athens, Greece;
4. Department of Gynecological Oncology, “Iaso” Maternity Hospital, Athens, Greece;