1. Department of Cardiology, Electrophysiology and Pacing; Queen's University, Kingston General Hospital; Kingston; Ontario; Canada
2. Dr. Carlos Alberto Studart Gomes Messejana's Hospital; Fortaleza; Ceará; Brazil
3. Cardiology Discipline, ABC Medical Faculty; ABC Foundation; Santo André; São Paulo; Brazil
4. Valle del Golfo Health Center; Sanitary Services Health Area; Canary Island; Spain