[1] Univ Liverpool, Liverpool John Moores Univ, Liverpool Ctr Cardiovasc Sci, Liverpool, England
[2] Liverpool Heart & Chest Hosp, Liverpool, England
[3] Univ Thessaly, Fac Med, Sch Hlth Sci, Dept Internal Med, Larisa, Greece
[4] Aalborg Univ, Danish Ctr Hlth Serv Res, Dept Clin Med, Aalborg, Denmark
[5] Natl & Kapodistrian Univ Athens, Alexandra Hosp, Dept Clin Therapeut, Athens, Greece
[6] Hellen Cardiovasc Res Soc, Athens, Greece