1. 1 University Clinic of Gastroenterohepatology, Faculty of Medicine , Ss. Cyril and Methodius University , Skopje , RN Macedonia
2. 2 University of Ss. Cyril and Methodius , Faculty of Medicine, Institute of Pathology , Skopje , RN Macedonia
3. 3 University Clinic of Digestive Surgery, Faculty of Medicine , Ss. Cyril and Methodius University , Skopje , RN Macedonia