1. Department of Obstetrics and Gynecology, Soroka University Medical Center, School of Medicine, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel;
2. Department of Epidemiology, School of Medicine, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel;
3. Department of Neonatology, Soroka University Medical Center, Ben Gurion University of the Negev, Beer Sheva, Israel;
4. Department of Obstetrics and Gynecology, Fondazione MBBM, San Gerardo Hospital, Monza, Italy