[1] NHLI London, London, England
[2] Hull Med Sch, Dept Acad Cardiol, Kingston Upon Hull, N Humberside, England
[3] Klinikum Stadt Ludwigshafen, Dept Cardiol, D-6700 Ludwigshafen, Germany
[4] Univ Heidelberg, Sch Med, Dept Cardiol, D-6900 Heidelberg, Germany
[5] Univ Hosp Verona, Dept Cardiol, Verona, Italy
[6] Mil Hosp, Dept Cardiol, Wroclaw, Poland