1. Centre for Heart Rhythm Disorders, University of Adelaide and Royal Adelaide Hospital , Port Road, 5000 Adelaide , Australia
2. Karolinska Institutet, Department of Medicine, Huddinge, Karolinska University Hospital , Stockholm , Sweden
3. Department of Cardiology, Copenhagen University Hospital—Rigshospitalet , Copenhagen , Denmark
4. Department of Cardiology and Cardiovascular Research Centre Maastricht (CARIM), Maastricht University Medical Centre , Maastricht , The Netherlands
5. Cardiology, University College London & Barts Heart Centre , London , UK
6. Cardiology Division, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Policlinico di Modena , Modena , Italy
7. Department of Cardiology, University of Groningen, University Medical Centre Groningen , Groningen , The Netherlands