1. Department of Neurology (C.G.S., A.J.W., E.L.G.), University of California San Francisco; Department of Neurology (J.F.B.), Ohio State Wexner Medical Center, Columbus; Department of Neurology (J.P.B.), Kaiser Permanente Northern California, San Francisco; Philip R. Lee Institute for Health Policy Studies (E.L.G.), University of California, San Francisco.