[1] Mayo Clin, Rochester, MN USA
[2] Univ Pavia, Fdn Salvatore Maugeri, I-27100 Pavia, Italy
[3] NYU, New York, NY USA
[4] Univ Hosp Hamburg Eppendorf, Hamburg, Germany
[5] Childrens Natl Med Ctr, Washington, DC USA
[6] George Washington Sch Med, Washington, DC USA
[7] Girona Inst Biomed Res, Girona, Spain
[8] Univ Girona, Sch Med, Girona, Spain
[9] Johns Hopkins Univ, Baltimore, MD USA
[10] St Georges Univ London, London, England
[11] Massachusetts Gen Hosp, Cardiac Arrhythmia Serv, Boston, MA 02114 USA
[12] Univ Ottawa, Inst Heart, Ottawa, ON, Canada
[13] Hosp Sick Children, Toronto, ON, Canada
[14] Univ Miami, Miller Sch Med, Miami, FL 33136 USA
[15] Univ Paris 05, Paris, France
[16] Inst Thorax, Nantes, France
[17] UCL, Inst Cardiovasc Sci, London, England
[18] Univ Hosp Muenster, Munster, Germany
[19] Univ Sydney, Sydney, NSW 2006, Australia
[20] Cincinnati Childrens Hosp, Cincinnati, OH USA
[21] Univ Oxford, John Radcliffe Hosp, Oxford OX3 9DU, England
[22] Univ Amsterdam, Acad Med Ctr, NL-1105 AZ Amsterdam, Netherlands
[23] Ludwigsburg Clin, Ludwigsburg, Germany
[24] Indiana Univ, Sch Med, Krannert Inst Cardiol, Indianapolis, IN 46202 USA