[1] Umberto I Hosp, Dept Cardiol, Arrhythmol Sect, Venice Mestre, Italy
[2] Cleveland Clin Fdn, Dept Cardiovasc Med, Cleveland, OH 44195 USA
[3] Herz Zentrum, Arrhythmia Serv, Bad Krozingen, Germany
[4] Johns Hopkins Univ Hosp, Dept Cardiol, Baltimore, MD 21287 USA
[5] Natl Yang Ming Univ, Sch Med, Dept Med, Div Cardiol, Taipei 112, Taiwan
[6] Vet Gen Hosp, Taipei, Taiwan
[7] CHU Bordeaux, Hosp Haut Leveque, Bordeaux, France
[8] Univ Leipzig, Ctr Heart, Dept Cardiol, D-7010 Leipzig, Germany
[9] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, London, England
[10] Royal Brompton Hosp, London SW3 6LY, England
[11] Harefield Hosp, London, England
[12] Gen Hosp St Georg, Dept Med 2, D-20099 Hamburg, Germany
[13] Hosp Univ Penn, Dept Med, Div Cardiovasc, Philadelphia, PA 19104 USA
[14] Univ Pavia, Salvatore Maugeri Fdn, Mol Cardiol Lab, I-27100 Pavia, Italy
[15] Mayo Clin, Dept Clin Cardiac Electrophysiol & Internal Med, Rochester, MN USA
[16] San Raffaele Univ Hosp, Dept Cardiol, Electrophysiol & Cardiac Pacing Unit, Milan, Italy
[17] St Vincent Hosp, Indianapolis, IN USA
[18] Hlth Care Ctr Program, Indianapolis, IN USA
[19] St Bartholomews Hosp, London, England
[20] Cardiol Cantonal Hosp Geneva, Geneva, Switzerland
[21] Univ Toronto, Toronto, ON, Canada