1. Department of Cardiology and the Heart Failure Clinic, University Hospital of Larissa, University of Thessaly School of Medicine, Larissa, Greece
2. Nuclear Medicine Unit, Hellenic Airforce (HAF) and Veterans Administration (VA) General Hospital, Athens, Greece
3. Department of Internal Medicine, Hellenic Airforce (HAF) and Veterans Administration (VA) General Hospital, Athens, Greece
4. Department of Endocrinology and Metabolic Diseases, University Hospital of Larissa, University of Thessaly School of Medicine, 41110 Larissa, Greece