1. Institute for Treatment and Rehabilitation „Niška Banja“, Niška Banja + Faculty of Medicine, Niš
2. General Hospital, Vranje
3. Institute for Treatment and Rehabilitation „Niška Banja“, Niška Banja
4. Clinical Center of Niš, Clinic of Cardiology, Niš
5. State University of Novi Pazar, Novi Pazar
6. Faculty of Medicine, Niš