[1] Ben Gurion Univ Negev, Fac Hlth Sci, Dept Epidemiol, IL-84105 Beer Sheva, Israel
[2] Barzilai Govt Hosp, Dept Obstet & Gynecol, Ashqelon, Israel
[3] Gertner Inst Epidemiol & Hlth Policy Res, Women & Childrens Hlth Res Unit, Tel Hashomer, Israel
[4] Tel Aviv Univ, Sackler Fac Med, Sch Publ Hlth, IL-69978 Tel Aviv, Israel