1. From the Minneapolis Heart Institute Foundation (M.R.M., B.T.U., M.N.B., K.Y.K., K.J.G., T.D.H., W.T.K., S.S., J.S.H.), Department of Emergency Medicine (P.A.S.), and Critical Care Services (W.M.P.), Abbott Northwestern Hospital, Minneapolis, MN; Center for Healthcare Innovation, Allina Hospitals and Clinics, Minneapolis, MN (L.L.B.); Allina Medical Transportation, St Paul, MN (P.A.S.); and Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis (J.S.H.).