Gabriel Levin1, Amihai Rottenstreich1,2, Raanan Meyer3. 1. The Department of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel. 2. The Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel. 3. The Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, Ramat-Gan, Israel. raananmeir@gmail.com.