1. Clinical Center of Vojvodina, Department of Gynaecology and Obstetrics, Novi Sad, Serbia + University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia
2. Subotica Medical Center, Department of Gynaecology and Obstetrics, Subotica, Serbia
3. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + Oncology Institute of Vojvodina, Department of Gynaecology, Sremska Kamenica, Serbia