1. Diagnostic Centre University Clinic for Development of Innovative Patient Pathways, Silkeborg Regional Hospital Falkevej 3 Silkeborg 8600 Denmark
2. Department of Clinical Medicine Aarhus University Aarhus Denmark
3. Danish Center for Clinical Health Services Research, Department of Clinical Medicine Aalborg University Aalborg Denmark
4. Liverpool Centre for Cardiovascular Science University of Liverpool and Liverpool Chest and Heart Hospital Liverpool UK
5. Department of Clinical Medicine Aalborg University Aalborg Denmark
6. Department of Medicine Boston University School of Medicine Boston MA USA
7. Department of Epidemiology Boston University School of Public Health Boston MA USA
8. Department of Biostatistics Boston University School of Public Health Boston MA USA