1. Pacing & Electrophysiology Unit, Cardiology Department Coimbra's Hospital and University Center Coimbra Portugal
2. Cardiology Department University Hospital Center of São João Porto Portugal
3. Cardiology Department Vila Nova de Gaia & Espinho Hospital Center Portugal
4. Cardiology Department Clinique Saint Pierre Perpignan France
5. ICBR, Faculty of Medicine University of Coimbra Coimbra Portugal