[1] Erasmus MC, Rotterdam, Netherlands
[2] Univ Ferrara, S Anna Hosp, I-44100 Ferrara, Italy
[3] Royal Brompton Hosp, London SW3 6LY, England
[4] Hosp Reg Univ Lille, Cardiol Hosp, Lille, France
[5] Royal Prince Alfred Hosp, Dept Cardiol, Sydney, NSW, Australia