1. Military Medical Academy, Institute of Epidemiology, Belgrade
2. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade + Military Medical Academy, Department of Psychiatry, Belgrade
3. Department of Defence HIV/AIDS Prevention Program (DHAPP), Naval Health Research Center (NHRC), San Diego, United States of America
4. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade + Military Medical Academy, Department for Prevention and Control of Nosocomial Infections, Belgrade