1. Department of Visceral Surgery. University Surgery Hospital “St. Naum Ohridski” , 1000 Skopje , North Macedonia
2. Medical Faculty in Skopje, Ss. Cyril and Methodius University in Skopje , 1000 Skopje , North Macedonia
3. Department of Radiology, University Surgery Hospital “St. Naum Ohridski” , 1000 Skopje , North Macedonia
4. Institute of Pathology , Medical Faculty in Skopje, 1000 Skopje , North Macedonia
5. Department of General Surgery, General Hospital Kumanovo , 1300 Kumanovo , North Macedonia
6. Department of General Surgery, Prof. Dr. Cemil Taşcıoğlu Şehir Hastanesi , 34384 Şişli/Istanbul , Turkey