1. From the Department of Neurology, Kaiser Permanente Orange County, Anaheim, CA (A.R.N.); Department of Neurology, University of Southern California, Los Angeles (N.S., M.K.-T.); Department of Emergency Medicine and Neurology (S.J.S., S.S.), Department of Emergency (F.D.P.), Department of Neurology (A.R.N., K.S., D.S.L., L.K.S., L.R., M.V.-S., J.L.S.), and Department of Biomathematics (J.G.), University of California, Los Angeles; Los Angeles EMS Agency, Orange County EMS Agency, Santa Ana, CA (S.J.S...