Dimitrios Patoulias1, Christodoulos Papadopoulos2, Michael Doumas3. 1. Second Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, General Hospital "Hippokration", Thessaloniki, Greece. Electronic address: dipatoulias@gmail.com. 2. Third Department of Cardiology, Aristotle University of Thessaloniki, General Hospital "Hippokration", Thessaloniki, Greece. 3. Second Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, General Hospital "Hippokration", Thessaloniki, Greece; Veterans Affairs Medical Center, George Washington University, Washington, DC, USA.