1. University Clinic of Gynecology and Obstetrics Narodni Front, Belgrade, Serbia
2. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + Institute of Microbiology and Immunology, Belgrade, Serbia
3. University Clinic of Gynecology and Obstetrics Narodni Front, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
4. Community Health Center, Rožaje, Montenegro
5. State Hospital, Gynecology and Obstetrics Departement, Novi Pazar, Serbia