1. Department of Cardiology; Larissa University Hospital; Larissa Greece
2. Department of Cardiology; Athens University Hospital Attikon; Athens Greece
3. Kaufman Center for Heart Failure; Cleveland Clinic and the Cleveland Clinic Lerner College of Medicine; Cleveland OH USA
4. The Ohio State University, Columbus, OH, USA; Biomedical Research Foundation Academy of Athens, Athens, and; Aristotelian University of Thessaloniki; Thessaloniki Greece
5. Cardiology Division, School of Medicine; Stony Brook University; Stony Brook NY USA