1. Department of Obstetrics and Gynecology, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel;
2. Department of Public Health, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel;
3. Ministry of Health, Jerusalem, Israel;
4. Department of Neonatology, Soroka University Medical Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel