1. Department of Visceral Surgery, University Surgery Hospital “St. Naum Ohridski” Skopje , North Macedonia
2. Medical Faculty in Skopje, Ss. Cyril and Methodius University in Skopje , North Macedonia
3. Department of Radiology, University Surgery Hospital “St. Naum Ohridski” Skopje , North Macedonia
4. Institute of Pathology , Medical Faculty in Skopje , North Macedonia
5. Department of General Surgery, General Hospital Strumica , North Macedonia
6. Faculty for Medical Sciences, University “Goce Delchev” , Shtip, North Macedonia