[1] Univ Heart Ctr, Depatment Cardiol 2, Freiburg, Germany
[2] Univ Bergen, Dept Clin Sci, Cardiol Sect, Bergen, Norway
[3] Asklepios Clin St Georg, Dept Cardiol, Hamburg, Germany
[4] Univ Oslo, Ctr Prevent Med, Oslo, Norway
[5] Copenhagen Univ Hosp, Rigshosp, Ctr Heart, Dept Cardiol, Copenhagen, Denmark
[6] Guys St Thomas Hosp Trust, Ctr Cardiothorac, London, England
[7] Univ S Manchester Hosp, Dept Cardiol, Manchester M20 8LR, Lancs, England
[8] Univ Basel Hosp, Dept Cardiol, CH-4031 Basel, Switzerland