1. From the Departments of Neurology (M.A., A.B., K.N., M.-L.M., H.P.M.), Pediatrics (M.S., S.J.M.), and Neuroradiology (L.R., G.S.), University Hospital of Berne, Inselspital, University of Berne, Berne, Switzerland; and the Department of Neurology (R.W.B.), University Hospital of Zurich, Zurich, Switzerland.