1 Department of Emergency, Internal Medicine and Cardiology, Division of Cardiology, S. Maria delle Croci Hospital, Viale Randi 5, 48121 Ravenna, Italy.
2 School of Life and Medical Sciences, Postgraduate Medical School, University of Hertfordshire, College Lane, AL10 9AB Hatfield, UK.
3 Faculty of Medicine, National Heart & Lung Institute, Imperial College, SW3 6LY London, UK.
4 Cardiovascular-Program ICCC, IR-Hospital Santa Creu I Sant Pau, IIB Sant Pau, 08025 Barcelona, Spain.