1. First Department of Cardiology Athens University School of Medicine Athens Greece
2. Patras University School of Medicine Patras Greece
3. Red Cross Hospital Athens Greece
4. University of Bristol Bristol UK
5. Canterbury Christ Church University Canterbury UK
6. Onassis Cardiac Surgery Center Athens Greece
7. First Department of Internal Medicine, Division of Endocrinology and Metabolism, Diabetes Center, Medical School AHEPA University Hospital Thessaloniki Greece