1. Serbian Medical Society, Academy of Medical Sciences, Belgrade, Serbia
2. University Children’s Hospital, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
3. Singidunum University, Faculty of Health, Legal and Business Studies, Valjevo, Serbia
4. University Clinical Center of Kragujevac, Pediatric Clinic, Kragujevac, Serbia + University of Kragujevac, Faculty of Medical Sciences, Kragujevac, Serbia
5. Railways of Serbia Institute for Health Care of Workers, Belgrade, Serbia