1. Department of Public Health; Ben-Gurion University of the Negev; Beer-Sheva Israel
2. Faculty of Health Sciences; Ben-Gurion University of the Negev; Beer-Sheva Israel
3. Clalit Health Services; Southern District; Beer-Sheva Israel
4. Maccabi Health Services; Tel Aviv Israel
5. Department of Obstetrics and Gynecology; Soroka Medical Center; Beer-Sheva Israel