[1] Leiden Univ, Med Ctr, Dept Cardiol, NL-2333 ZA Leiden, Netherlands
[2] Interuniv Cardiol Inst Netherlands, Utrecht, Netherlands
[3] Prince Wales Hosp, Div Cardiol, Shatin, Hong Kong, Peoples R China
[4] Heidelberg Univ, Klinikum Mannheim, Dept Cardiol, Heidelberg, Germany
[5] Leiden Univ, Med Ctr, Dept Radiol, Leiden, Netherlands
[6] Hammersmith Hosp, Imperial Coll London, NHLI, London, England
[7] Hammersmith Hosp, Cardiothorac Directorate, London, England