1. Department of Obstetrics and Gynecology, Assaf Harofeh Medical Center, Zerifin, Israel;
2. Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel;
3. Department of Obstetrics and Gynecology, Columbia University Medical Center, New York, NY, USA;
4. Department of Obstetrics and Gynecology, Meir Medical Center, Kfar Saba, Israel