1. Institute of Epidemiology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
2. Unit for Communicable Diseases, Center for Disease Control and Prevention, Institute of Public Health of Belgrade, Belgrade, Serbia
3. Institute of Hygiene and Medical Ecology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
4. Center for Medical Genetics, Institute for Children and Youth Health Care of Vojvodina, Novi Sad, Serbia
5. Department of Pediatrics, Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia