[1] Univ Belgrade, Sch Med, Doktora Subotica 8, Belgrade 11000, Serbia
[2] Clin Ctr Serbia, Clin Gynecol & Obstet, Dr Koste Todorovica 26, Belgrade 11000, Serbia
[3] Univ Freiburg, Dept Gynecol & Obstet, St Josefskrankenhaus, Teaching Hosp, Sautierstr 1, D-79104 Freiburg, Germany
[4] Clin Ctr Serbia, Dept Histopathol, Dr Koste Todorovica 6, Belgrade 11000, Serbia
[5] Inst Epidemiol, Dr Koste Todorovica 26A, Belgrade 11000, Serbia