1. Department of Obstetrics and Gynecology, Faculty of Health Sciences, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel,
2. Faculty of Health Sciences, Soroka University Medical Center, Clalit Health Services (Southern District), Ben-Gurion University of the Negev, Beer-Sheva, Israel, and
3. Department of Public Health, Ben-Gurion University of the Negev, Beer-Sheva, Israel