1. Danish Heart Foundation , Vognmagergade 7, 1120 Copenhagen , Denmark
2. Section of Biostatistics, University of Copenhagen , Copenhagen , Denmark
3. Department of Cardiology, Roskilde University Hospital , Zealand , Denmark
4. Department of Cardiology, Bispebjerg and Frederiksberg Hospital , Copenhagen , Denmark
5. Department of Cardiology, The Heart Centre, Copenhagen University Hospital, Rigshospitalet , Copenhagen , Denmark
6. Departments of Clinical Investigation and Cardiology, North Zealand University Hospital , Hillerød , Denmark
7. Department of Cardiology, Copenhagen University Hospital, Herlev and Gentofte , Herlev , Denmark
8. Department of Pediatric Cardiology, Rigshospitalet , Copenhagen , Denmark
9. Department of Cardiology, Copenhagen University Hospital, Herlev and Gentofte , Hellerup , Denmark
10. Department of Clinical Medicine, University of Copenhagen , Copenhagen , Denmark