1. Department of Cardiology, The Heart Center Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen, Denmark
2. Institute of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2100 Copenhagen, Denmark
3. Cardiovascular Research Unit, University of Southern Denmark, Baagoees Allé 15, DK-5700 Svendborg, Denmark
4. Kettering General Hospital NHS Foundation Trust, University Hospitals Northamptonshire, Kettering NN1 5BD, Northamptonshire, UK
5. University College London, Gower St., London WC1E 6BT, UK
6. Department of Cardiology, Lund University Hospital, Entrégatan 7, SE-22242 Lund, Sweden