1. From the Department of Emergency Medicine (B.J.B., P.R.B.) and Resuscitation Science Center (B.J.B.), Maricopa Medical Center, Phoenix, AZ; Arizona Department of Health Services (B.J.B., V.C., P.R.B.), Bureau of EMS and Trauma System, Phoenix, AZ; Arizona Emergency Medicine Research Center (B.J.B., D.W.S., K.D.), Department of Emergency Medicine, University of Arizona, Tucson, AZ; Department of Emergency Medicine (T.F.V.), Mayo Clinic, Jacksonville, FL; The American Heart Association (J.P.), Dallas,...