1. Serbian Medical Society, Academy of Medical Sciences, Belgrade
2. University Children’s Hospital, Belgrade + Faculty of Medicine, Belgrade
3. Valjevo Medical Centre, Valjevo
4. University Children’s Hospital, Belgrade
5. Kragujevac Clinical Center, Pediatric Clinic, Kragujevac + Faculty of Medical Sciences, Kragujevac
6. Novi Pazar General Hospital, Novi Pazar
7. University of Banja Luka, School of Medicine, Republic of Srpska, Bosnia and Herzegovina