1. Department of Obstetrics and Gynecology; Barzilai Medical Center; Ashkelon; Israel
2. Department of Obstetrics and Gynecology; Bikur Holim Hospital; Jerusalem; Israel
3. Department of Obstetrics and Gynecology; Shaare Zedek Medical Center; Jerusalem; Israel
4. Department of Otolaryngology; Shaare Zedek Medical Center; Jerusalem; Israel
5. Department of Obstetrics and Gynecology; Hadassah-Hebrew University Medical Centers; Jerusalem; Israel