1. Pacing & Electrophysiology Unit, Cardiology Department, Coimbra’s Hospital and University Center , Morada: Praceta Prof Mota Pinto, 3000-075 Coimbra , Portugal
2. Cardiology Department, Sussex Cardiac Centre , Brighton , UK
3. Institute of Cardiovascular Science, University College London , London , UK
4. Cardiology Department, Hartcentrum Hasselt , Hasselt , Belgium
5. Cardiology Department, Hospital da Luz Arrábida , V. N. Gaia , Portugal
6. Division of Cardiology, Department of Medicine, Medical University of Graz , Graz , Austria
7. Cardiology Department, University Hospital Centre Zagreb , Zagreb , Croatia
8. Arrhythmia Unit, Cardiology Department, Santa Maria University Hospital, Lisbon Academic Medical Center , Lisbon , Portugal
9. Cardiology Department, Clinique Saint Pierre , Perpignan , France
10. Cardiology Department, Centro Hospitalar de Entre Douro e Vouga , Santa Maria da Feira , Portugal
11. Cardiology Department , University Center Hospital of Santiago, Santiago de Compostela , Spain
12. Cardiology Department, University Hospital Center of São João , Porto , Portugal
13. Biosense Webster , Portugal
14. Faculty of Medicine, ICBR, University of Coimbra , Coimbra , Portugal
15. Cardiology Department, Santa Marta Hospital , Lisboa , Portugal