1. Department of Obstetrics and Gynecology; Faculty of Medicine; Clinical Centre of Vojvodina; University of Novi Sad; Novi Sad Serbia
2. Department of Biology and Ecology; Faculty of Sciences; University of Novi Sad; Novi Sad Serbia
3. Institute of Occupational Health Novi Sad; Novi Sad Serbia
4. Faculty of Medicine; University of Novi Sad; Novi Sad Serbia
5. Primary Health Care Bač; Bač Serbia
6. Department of Pharmacy; Faculty of Medicine; University of Novi Sad; Novi Sad Serbia