[1] Department of Obstetrics and Gynecology,
[2] Faculty of Health Sciences,undefined
[3] Soroka University Medical Center,undefined
[4] Ben Gurion University of the Negev,undefined
[5] P.O. Box 151,undefined
[6] Beer-Sheva,undefined
[7] Israel Tel. +972-7-6400774,undefined
[8] Fax: +972-7-6275338,undefined
[9] Epidemiology and Health Services Evaluation Department,undefined
[10] Faculty of Health Sciences,undefined
[11] Ben Gurion University of the Negev,undefined
[12] Beer-Sheva,undefined
[13] Israel,undefined
[14] Faculty of Health Sciences,undefined
[15] Ben Gurion University of the Negev,undefined
[16] Beer-Sheva,undefined
[17] Israel,undefined