[1] Barzilai Univ, Med Ctr, Dept Cardiol, Hahistadrout St 2, IL-30604 Ashqelon, Israel
[2] Virginia Commonwealth Univ, Pauley Heart Ctr, Div Cardiol, Dept Internal Med, 1200 East Marshall St, Richmond, VA 23298 USA
[3] Univ Genoa, Dept Internal Med, Clin Internal Med 1, Viale Benedetto XV 6, I-16132 Genoa, Italy
[4] Kings Coll London, Fac Life Sci & Med, Dept Cardiovasc Sci, London, England
[5] Azienda Sanit Univ Integrata Trieste, Cardiovasc Dept, Trieste, Italy
[6] Univ Trieste, Trieste, Italy
[7] Springer Nat, BMC Series, 4 Crinan St, London N1 9XW, England