1. University Antwerp and University Hospital of Antwerp, Cardiology department, Antwerp, Belgium
2. Cardiology Department, OLV Hospital, Moorselbaan, 164 Aalst B-9300, Belgium
3. Cardiology Department, Royal Brompton And Harefield Hospital Sydney Street Chelsea Wing, Level 4 London, SW3 6NP, UK
4. Cardiology Department, University Hospital of Leipzig, Leipzig, Germany
5. Department Radiology, Medical School and San Carlos University Hosp Radiology, Madrid 28040, Spain
6. Institute of Clinical Physiology, Pisa, Italy
7. Arrhythmia Section, Cardiology Department, Hospital Clínic, Universitat de Barcelona. IDIBAPS, Institut d’Investigació August Pi i Sunyer, Hospital Clínic de Barcelona Villarroel, 17008036 Barcelona, Spain
8. Cardiovascular Division, Brigham and Women's Hospital, 75 Francis Street Boston, MA 02115, USA