1. Second Propaedeutic Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, Hippocration Hospital, Thessaloniki, Greece
2. Cardiology Department, Onassis Cardiac Surgery Center, Athens, Greece
3. Molecular Immunology Laboratory, Onassis Cardiac Surgery Center, Athens, Greece
4. 1st Department of Internal Medicine and Diabetes Center, Tzaneio General Hospital of Piraeus, Piraeus, Greece
5. Nuclear Cardiology Department, Onassis Cardiac Surgery Center, Athens, Greece