1. Medical Faculty, Department of Internal Medicine; University of Niš; Niš Serbia
2. Department of Cardiology; Institute for Treatment and Rehabilitation Niška Banja; Niš Serbia
3. Department of Rheumatology; Institute for Treatment and Rehabilitation Niška Banja; Niš Serbia
4. Medical Faculty; University of Niš; Niš Serbia
5. Department of Cardiology; Clinic for Internal Diseases Intermedica, Niš, Serbia; and Veterans Affairs Medical Center; Washington District of Columbia