1. Second Propedeutic Department of Internal Medicine; Aristotle University; Thessaloniki Greece
2. Fifth Surgical Department; Aristotle University; Thessaloniki Greece
3. Department of Radiology; Hippokration Hospital; Thessaloniki Greece
4. Department of Radiology and Interventional Radiology; Aristotle University; Thessaloniki Greece
5. Third Department of Cardiology; Aristotle University; Thessaloniki Greece
6. Veterans Affairs Medical Center; George Washington University; Washington DC USA