1. From the Department of Cardiology The Heart Centre Rigshospitalet University of Copenhagen Copenhagen Denmark
2. Department of Clinical Epidemiology Aalborg University Hospital and Department of Health, Science and Technology Aalborg University Aalborg Denmark
3. Department of Cardiology The Cardiovascular Research Centre Herlev and Gentofte Hospital University of Copenhagen Hellerup Denmark
4. Department of Cardiology Lund University and Skåne University Hospital Lund Sweden
5. Sections of Preventive Medicine and Cardiology Departments of Medicine and Epidemiology Boston University Schools of Medicine and Public Health Boston MA USA