1. Department of Cardiology; Larissa University Hospital; Larissa Greece
2. Division of Cardiovascular Medicine, Department of Medicine; The Ohio State University; Columbus OH USA
3. Department of Cardiology, Hillingdon Hospital; Department of Transplantation; Harefield Hospital; London UK
4. The Ohio State University, Columbus, OH, USA; Biomedical Research Foundation Academy of Athens, Athens, and; Aristotelian University of Thessaloniki; Thessaloniki Greece
5. Department of Cardiology; Athens University Hospital Attikon; Athens Greece