1. University Clinic Digestive Surgery, Clinical Center “Mother Theresa” , 1000 Skopje, North Macedonia
2. Ss. Cyril and Methodius University in Skopje, 1000 Skopje , North Macedonia
3. University Clinic for Traumatology, Orthopedic Disease, Anesthesiology, Reanimation and Intensive Care and Emergency Department , Clinical Center “Mother Theresa”, 1000 Skopje, North Macedonia
4. Institute of Pathology Faculty of Medicine, , 1000 Skopje, North Macedonia
5. University Surgery Hospital “St. Naum Ohridski” Department of Visceral Surgery, 1000 Skopje, North Macedonia