[1] Univ Athens, Alexandra Gen Hosp, Sch Med, Dept Obstet & Gynaecol, Athens 11521, Greece
[2] Med Univ Vienna, Ctr Comprehens Canc, Inst Canc Res, Dept Med 1, Vienna, Austria
[3] Univ Athens, Alexandra Gen Hosp, Sch Med, Dept Clin Therapeut, Athens 11521, Greece
[4] Alexandra Gen Hosp, Dept Pathol, Athens, Greece
[5] Univ Athens, Sch Med, Dept Hyg Epidemiol & Med Stat, Athens 11521, Greece