1. From the Departments of Neurology (H.P.M., M.A., K.N., A.D.) and Neuroradiology (L.R., G.S.), University Hospitals of Bern, and the Departments of Neurology (D.G., C.B., D.B., C.v.B., R.W.B.) and Neuroradiology (A.P.), University Hospital of Zürich, Switzerland.