[1] Univ Belgrade, Inst Social Med, Fac Med, Belgrade, Serbia
[2] Univ Belgrade, Inst Epidemiol, Fac Med, Belgrade, Serbia
[3] Univ Belgrade, Fac Med, Univ Clin Ctr, Inst Obstet & Gynecol, Belgrade, Serbia
[4] Monash Univ, Fac Med, Sch Psychol & Psychiat, Clayton, Vic 3800, Australia