1. Clinic of Pediatrics; Clinical Center; Nis Serbia
2. Medical Faculty; University of Nis; Nis Serbia
3. Clinic of Neurology; Clinical Centre; Nis Serbia
4. Mother and Child Health Institute; “Dr Vukan Cupic”; Belgrade Serbia
5. Medical Faculty; University of Belgrade; Belgrade Serbia
6. Medical Faculty; Nikola Zivkovic; Institute of Pathology; University of Nis; Nis Serbia
7. Clinic for Cardiovascular Diseases; Institute for Treatment and Rehabilitation; Niska Banja; Nis Serbia