1. Medical Faculty, University of Nis; Department of Internal Medicine; Zorana Djindjica 81 Nis Serbia 18000
2. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; The Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
3. Medical Faculty, University of Nis; Institute of Anatomy; Boulevard Dr Zorana Djindjica 81 Nis Serbia 18000