Second Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, General Hospital "Hippokration", Greece. Electronic address: dipatoulias@gmail.com. Third Department of Cardiology, Aristotle University of Thessaloniki, General Hospital "Hippokration", Greece. Second Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, General Hospital "Hippokration", Greece. Second Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, General Hospital "Hippokration", Greece; Veterans Affairs Medical Center, George Washington University, Washington, District of Columbia.