1. Heart Failure Unit, 2nd Department of Cardiology, Attikon University Hospital, National and Kapodistrian University of Athens , Rimini 1, 12461 Athens , Greece
2. Department of Nursing, Cyprus University of Technology , 15 Vragadinou Street, 3041 Limassol , Cyprus
3. Cardiology Department, General Anti-Cancer Oncological Hospital Agios Savvas , 171 Alexandras Avenue, 11522 Athens , Greece
4. Emergency Medicine Department, Attikon University Hospital, National and Kapodistrian University of Athens , Rimini 1, 12461 Athens , Greece
5. Department of Physiology, University of Cyprus Medical School , Palaios dromos Lefkosias Lemesou No.215/62029 Aglantzia, P.O.Box 20537, 1678 Nicosia , Cyprus