1. First Department of General Surgery, General Hospital Papageorgiou, West Ring Road, Nea Efkarpia 56 403, Thessaloniki, Greece
2. Department of Radiology, General Hospital Papageorgiou, West Ring Road, Nea Efkarpia 56 403, Thessaloniki, Greece
3. Department of Gastroenterology, Euromedica Kyanous Stavros General Hospital, Vizyis-Vyzantos 1, 54 636 Thessaloniki, Greece