1. and Department of Internal Medicine - Gastroenterology and Hepatology, Medical Faculty, University of Nis; Cochrane Hepato-Biliary Group, Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 3344, Rigshospitalet, Copenhagen University Hospital; Zorana Djindjica 81 Nis Serbia 18000
2. Gentofte University Hospital; Department of Internal Medicine; Niels Andersensvej 65 Hellerup Denmark 2900
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 3344, Rigshospitalet, Copenhagen University Hospital; Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Denmark DK-2100
4. Medical Faculty, University of Nis; Institute of Anatomy; Boulevard Dr Zorana Djindjica 81 Nis Serbia 18000
5. Medical Faculty, University of Nis; Department of Internal Medicine - Gastroenterology and Hepatology; Boulevard Dr Zorana Djindjica 81 Nis Serbia 18000