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