[1] Kantonsspital Lucerne, Div Cardiol, Luzern, Switzerland
[2] Univ Zurich, ISPM, AMIS Plus Data Ctr, Zurich, Switzerland
[3] Univ Zurich Hosp, Div Cardiol, CH-8091 Zurich, Switzerland
[4] Hop Tour, Cardiovasc Dept, Geneva, Switzerland
[5] Univ Lausanne Hosp, Div Cardiol, Lausanne, Switzerland
[6] Kantonsspital, Div Internal Med, St Gallen, Switzerland
[7] Stadtspital Triemli, Zurich, Switzerland
[8] Univ Hosp Bern, CH-3010 Bern, Switzerland