1. Department of Surgery, General Hospital St Pavlos, Thessaloniki - Greece
2. B' Department of Surgery, General Hospital Papageorgiou, Thessaloniki - Greece
3. Department of Radiology, General Hospital Papageorgiou, Thessaloniki - Greece
4. Renal Department, General Hospital, AHEPA, Thessaloniki - Greece
5. Renal Department, General Hospital, Komotini - Greece
6. Department of Cardiovascular Surgery, Aristotelian University, Thessaloniki - Greece