1. Department of Emergency Medicine; Brigham and Women's Hospital, Harvard Medical School; Boston MA USA
2. British Heart Foundation Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences; University of Glasgow; Glasgow UK
3. Cardiovascular Division, Brigham and Women's Hospital; Harvard Medical School; Boston MA USA
4. Department of Molecular and Clinical Medicine; University of Gothenburg; Gothenburg Sweden
5. National Heart and Lung Institute; Imperial College London; London UK
6. Division of Cardiology, Department of Medicine; Duke University Medical Center; Durham NC USA
7. Population Health Research Institute, Hamilton Health Sciences; McMaster University; Hamilton ON Canada