1. Santa Creu i Sant Pau Hospital; Cardiovascular Research Center; CSIC-ICCC; Barcelona Spain
2. Department of Electrocardiology, Sterling Regional Center for Heart Disease; Medical University of Lodz; Poland
3. Cardiac Electrophysiology and Pacing; Kingston General Hospital; Queen's University; Ontario Canada
4. Coronary Care Unit, IdISPa, Son Espases Hospital; Palma de Mallorca; Spain
5. The Section of Cardiology; The Department of Medicine; Baylor College of Medicine; Houston TX
6. Heart Hospital; Tampere University Hospital, and University of Tampere; Tampere Finland
7. Sanitary Health Services, E1 Hierro; Valle del Golfo Health Center; Canary Islands Spain
8. Tel-Aviv University, Ramat Aviv; Tel Aviv; Israel
9. Cardiovascular Research Center; Maastrich The Netherlands
10. Cardiovascular Department (AFNET); Clinical University Institute Münster; Münster Germany