1. 1Clinic of Obstetrics and Gynecology, Clinical Center of Serbia, Dr Koste Todorovica 26, 11000, Belgrade, Serbia
2. 4Occupational Health Department, General Health Center “Savski Venac”, Pasterova 1, 11000, Belgrade, Serbia
3. 5Department of Cellular Pathology, PathLinks Pathology Services, Lincoln County Hospital, Greetwell Road, Lincoln, LN2 5QY, UK