1. Heart Institute - Hospital Universitari Germans Trias I Pujol; Badalona Spain
2. Atrial Fibrillation Unit (UFA) - Hospital Clínic; Barcelona Spain
3. Cardiology Department-Complexo Hospitalario Universitario de Vigo; Vigo Spain
4. Division of Cardiology; University of Washington; Seattle Washington USA
5. Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer (IDIBAPS); Barcelona Spain
6. Comprehensive Arrhythmia Research and Management (CARMA) Center - University of Utah; Salt Lake City Utah USA