1. Department of Cardiology; Larissa University Hospital; PO Box 1425 411 10 Larissa Greece
2. Department of Internal Medicine and Cardiology, Charité University Medicine Berlin-Campus Virchow Klinikum, and Department of Internal Medicine and Cardiology, German Heart Centre; Berlin Centre for Heart Failure; Berlin Germany
3. Cardiology Division, School of Medicine; Stony Brook University; Stony Brook NY USA
4. Department of Cardiology; Athens University Hospital Attikon; Athens Greece
5. Laboratory of Physiopharmacology (Building T2); University of Antwerp; Universiteitsplein 1 Antwerp 2610 Belgium
6. Ohio State University; Columbus Ohio USA
7. Biomedical Research Foundation Academy of Athens; Athens, and Aristotelian University of Thessaloniki; Thessaloniki Greece