1. Department of Public Health, Faculty of Health Sciences; Ben-Gurion University of the Negev; Beer-Sheva Israel
2. Maccabi Healthcare Services; Beer-Sheva Israel
3. Centre for Research on Inner City Health, The Keenan Research Centre for Biomedical Science; Li Ka Shing Knowledge Institute; St. Michael's Hospital; Toronto Canada
4. Department of Obstetrics and Gynecology, Soroka University Medical Center; Ben-Gurion University of the Negev; Beer-Sheva Israel
5. Royal Victoria Hospital; Department of Obstetrics and Gynecology; McGill University; Montreal Canada
6. Maccabi Healthcare Services; Rahat Clinic; Southern Region; Israel