1. Department of Visceral Surgery, University Surgery Hospital “St. Naum Ohridski” , Bul. 11 Oktomvri br. 53, 1000 Skopje , North Macedonia
2. Medical Faculty in Skopje, Ss. Cyril and Methodius University in Skopje , Ul. 50-ta divizija br. 6, 1000 Skopje , North Macedonia
3. Department of Surgery, General Hospital Kumanovo , Ul. 11 Oktomvri bb, 1300 Kumanovo , North Macedonia