1. University Clinic of Gastroenterohepatology, Medical Faculty, Ss. Cyril and Methodius University, Mother Teresa 17, 1000 Skopje, Macedonia
2. University Clinic of Hematology, Medical Faculty, Ss. Cyril and Methodius University, Mother Teresa 17, 1000 Skopje, Macedonia
3. University Clinic of Digestive Surgery, Medical Faculty, Ss. Cyril and Methodius University, Mother Teresa 17, 1000 Skopje, Macedonia