1. From the Neurology Service (T.B., P.V., G.D.L., R.A.D.P., R.B.-V.), Department of Clinical Neurosciences, Transplantation Center (D.G.), Department of Medicine, and Pathology Department (J.-P.B.), Lausanne University Hospital (Centre Hospitalier Universitaire Vaudois) and the University of Lausanne; and Service of Clinical Pathology (K.E., D.M.), Department of Pathology and Immunology and Diagnostic Department, University Hospitals of Geneva, Switzerland.