1. Department of Cardiology, Diagnostic Centre, University Clinic for Development of Innovative Patient Pathways, Silkeborg Regional Hospital , Falkevej 1, 8600 Silkeborg , Denmark
2. Department of Clinical Medicine, Aarhus University Hospital , Palle Juul-Jensens Boulevard 99, 8200 Aarhus N , Denmark
3. Department of Clinical Medicine, Danish Center for Health Services Research, Aalborg University , Selma Lagerløfs Vej 249, 9260 Gistrup , Denmark
4. Department of Medicine, Boston Medical Center, Boston University Chobanian and Avedisian School of Medicine , 715 Albany St, Boston, MA 02118 , USA
5. Department of Epidemiology, Boston University School of Public Health , 715 Albany St, Boston, MA 02118 , USA
6. Tufts Clinical and Translational Science Institute, Tufts University , 35 Kneeland St, Boston, MA 02111 , USA
7. Institute for Clinical Research and Health Policy Studies, Tufts Medical Center , 800 Washington St, Boston, MA 0211 , USA
8. Department of Biostatistics, Boston University School of Public Health , 801 Massachusetts Avenue, Boston, MA 02118 , USA