Part of this publication was performed in partial fulfillment of the MD thesis requirements of the Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.;2. Department of Obstetrics and Gynecology, Assaf Harofeh Medical Center, Zerifin, Israel, affiliated with the Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel;3. Department of Obstetrics and Gynecology, Western Galilee Hospital, Nahariya, Galilee Faculty of Medicine, Bar Ilan university, Safed, Israel