1. Ss. Cyril and Methodius University, Faculty of Medicine, Department of Preclinical and Clinical Pharmacology and Toxicology, Skopje, Republic of Macedonia
2. Ss. Cyril and Methodius University, Faculty of Medicine, Digestive Surgery Clinic, Skopje, Republic of Macedonia
3. Ss. Cyril and Methodius University, Faculty of Medicine, Department of Pathology, Skopje, Republic of Macedonia