1. From the Departments of Neurology (Y.W.W., A.M.G., H.C.G.), Pediatrics (Y.W.W., F.F.G., E.E.R., H.C.G.), and Epidemiology (H.C.G.), University of California, San Francisco, San Francisco, the Department of Pediatrics, Stanford University School of Medicine, Stanford (K.P.V.M., S. Bonifacio), and the Departments of Pediatrics (T.-W.W., J.L.W.) and Radiology (J.L.W., S. Bluml), Children’s Hospital Los Angeles, and the Departments of Pediatrics (T.-W.W., J.L.W.) and Radiology (J.L.W., S. Bluml), University...