1. Federation de Cardiologie; Hôpital Henri Mondor; Assistance Publique Hôpitaux de Paris and INSERM U955; Créteil France
2. UCLA Cardiac Arrhythmia Center; David Geffen School of Medicine; University of California-Los Angeles; Los Angeles California USA
3. University Hospital Rangueil Toulouse; France
4. Gill Heart Institute and VAMC, Cardiology Division; University of Kentucky; Lexington Kentucky USA