[1] Cleveland Clin, Cardiac Pacing & Electrophysiol, 9500 Euclid Ave, Cleveland, OH 44195 USA
[2] Karolinska Univ Hosp Stockholm, S-17176 Stockholm, Sweden
[3] Univ Hosp Geneva, CH-1205 Geneva, Switzerland
[4] Charite Hosp, D-10117 Berlin, Germany
[5] Maastricht Univ Med Ctr, NL-6211 LK Maastricht, Netherlands
[6] Hebrew Univ Jerusalem, Fac Med, Shaare Zedek Med Ctr, Dept Cardiol, IL-9112001 Jerusalem, Israel
[7] Cardio Arrhythmol Ctr, I-00186 Rome, Italy
[8] Aarhus Univ, Aarhus Univ Hosp, DK-8200 Aarhus, Denmark