1. Section of Cardiology; Baylor College of Medicine; Houston Texas
2. Department of Cardiology, The Heart Centre, Rigshospitalet; University of Copenhagen; Copenhagen Denmark
3. Department of Medicine; Nykøbing F Hospital; Nykøbing F Denmark
4. Department of Clinical Physiology, Skåne University Hospital; Lund University; Lund Sweden
5. Assistance Publique Hôpitaux de Paris; Hôpital Henri Mondor; Créteil France
6. Department of Cardiology B, Faculty of Medicine, Oslo University Hospital Ullevål; University of Oslo; Oslo Norway
7. Department of Cardiology; Stavanger University Hospital; Stavanger Norway
8. Department of Clinical Science; University of Bergen; Bergen Norway
9. Department of Cardiology; Aalborg University Hospital; Aalborg Denmark
10. Department of Clinical Medicine; Aalborg University Hospital; Aalborg Denmark
11. Institute of Regional Health Research; University of Southern Denmark; Odense Denmark
12. Department of General and Interventional Cardiology; University Heart Center Hamburg-Eppendorf; Hamburg Germany