1. Electrophysiology Section Duke University Hospital Durham North Carolina
2. Division of Cardiology Duke University Hospital Durham North Carolina
3. Department of Clinical Medicine Aalborg University Aalborg Denmark
4. Unit of Epidemiology and Biostatistics Aalborg University Hospital Aalborg Denmark
5. Department of Cardiology Aalborg University Hospital Aalborg Denmark
6. Department of Health Science and Technology Aalborg University Aalborg Denmark