1. Division of Gastroenterology, Department of Internal Medicine, General Hospital “Djordje Joanovic”, 5 Dr. Vase Savica Street, 23000 Zrenjanin, Serbia
2. Clinic of Gastroenterology and Hepatology, University Clinical Center of Serbia, 2 Dr. Koste Todorovica Street, 11000 Belgrade, Serbia
3. Faculty of Medicine, University of Belgrade, 8 Dr. Subotica Starijeg Street, 11000 Belgrade, Serbia
4. Department of Physical Medicine and Rehabilitation, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozar Markovic Street, 34000 Kragujevac, Serbia
5. Center for Physical Medicine and Rehabilitation, University Clinical Center Kragujevac, 30 Zmaj Jovina Street, 34000 Kragujevac, Serbia
6. Department of Internal Medicine, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozar Markovic Street, 34000 Kragujevac, Serbia
7. Clinic for Cardiology, University Clinical Center Kragujevac, 30 Zmaj Jovina Street, 34000 Kragujevac, Serbia
8. Clinic for Hematology, University Clinical Center Kragujevac, 30 Zmaj Jovina Street, 34000 Kragujevac, Serbia
9. Department of Pediatrics, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozar Markovic Street, 34000 Kragujevac, Serbia
10. Pediatric Clinic, University Clinical Center Kragujevac, 30 Zmaj Jovina Street, 34000 Kragujevac, Serbia
11. Department of Medical Statistics and Informatics, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozar Markovic Street, 34000 Kragujevac, Serbia
12. Clinic for Gastroenterology and Hepatology, University Clinical Center Kragujevac, 30 Zmaj Jovina Street, 34000 Kragujevac, Serbia