1. 1Faculty of Medicine, Clinical Center of Vojvodina — Department of Obstetrics and Gynecology, University of Novi Sad, Novi Sad, AP Vojvodina, Serbia
2. 2Faculty of Medicine, Oncology Institute of Vojvodina, Clinic for Surgical Oncology — Department of Gynecology, University of Novi Sad, Sremska Kamenica, AP Vojvodina, Serbia
3. 3Faculty of Medicine, Clinical Center of Vojvodina — Department for Infectious disease, University of Novi Sad, Novi Sad, AP Vojvodina, Serbia
4. 4Faculty of Medicine, Oncology Institute of Vojvodina, Department of Epidemiology, University of Novi Sad, Sremska Kamenica, AP Vojvodina, Serbia