1. Diagnostic Centre, Silkeborg Regional Hospital, Silkeborg, Denmark; and Department of Clinical Medicine Aarhus University Aarhus Denmark
2. Danish Center for Clinical Health Services Research Aalborg University Aalborg Denmark
3. Department of Industrial Engineering and Management Aalto University Espoo Finland
4. Lohja Hospital, Department of Internal Medicine, Helsinki and Uusimaa Hospital District, Lohja, Finland; Heart and Lung Center Helsinki University Hospital and University of Helsinki Helsinki Finland
5. Turku University Hospital and University of Turku Turku Finland
6. Institute of Environmental Medicine Karolinska Institutet Stockholm Sweden
7. Division of Family Medicine and Primary Care, Department of Neurobiology, Care Sciences and Society Karolinska Institutet Huddinge Sweden
8. Functional Area of Emergency Medicine Karolinska University Hospital Stockholm Sweden
9. Department of Internal Medicine Solna Karolinska Institutet Stockholm Sweden
10. Department of Cardiology Oslo University Hospital Ullevål Oslo Norway
11. University of Oslo Oslo Norway