1. From the Duke Clinical Research Institute Durham, NC (G.M.F.); Department of Emergency Medicine, Center for Cardiovascular Quality and Outcomes, Northwestern University, Feinberg School of Medicine, Chicago, Ill (P.S.P.); Departments of Medicine and Radiology, School of Medicine, University of North Carolina at Chapel Hill, NC (K.F.A.); Department of Cardiology, Castle Hill Hospital, University of Hull, Kingston-upon-Hull, UK (J.G.F.C.); Momentum Research Inc, Durham, NC (G.C.); Stavanger University...