1. Department of Physical Medicine, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
2. Center for Physical Medicine and Rehabilitation, Clinical Center Kragujevac, Kragujevac, Serbia
3. Department of Internal Medicine, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
4. Clinic for Cardiology, Clinical Center Kragujevac, Kragujevac, Serbia
5. Clinic for Pulmology, Clinical Center Kragujevac, Kragujevac, Serbia
6. Department of Medical Statistics and Informatics, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
7. Center for Gastroenterohepatology, Clinic for Internal Medicine, Clinical Center Kragujevac, Kragujevac, Serbia