[1] Hosp Univ Santiago de Compostela, Dept Cardiol, La Coruna, Spain
[2] Univ Santiago de Compostela, Inst Invest Sanitaria IDIS, La Coruna, Spain
[3] Ctr Invest Biomed Red Enfermedades Cardiovasc CIB, Madrid, Spain
[4] Univ Barcelona, Arrhythmia Sect, Dept Cardiol, Hosp Clin, Barcelona, Spain
[5] Inst Invest August Pi & Sunyer IDIBAPS, IDIBAPS, Barcelona, Spain