1. British Heart Foundation Centre for Cardiovascular Science, University of Edinburgh, United Kingdom (A.R.C., K.H., J.A., K.K.L., A.A., A.S.V.S., D.S., A.V.F., J.J., S.P., S.S., L.M., F.E.S., D.E.N., N.L.M.).
2. Department of Emergency Medicine (A.G.), Royal Infirmary of Edinburgh, United Kingdom.
3. Emergency Medicine Research Group of Edinburgh Research Group (A.G.), Royal Infirmary of Edinburgh, United Kingdom.
4. Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, UK (N.L.M.).