1. From the Department of Neurology, Heinrich-Heine-University, Medical Faculty, Düsseldorf, Germany (M.G., H.P.H., S.J.); Zentralinstitut für Klinische Chemie und Laboratoriumsdiagnostik, Heinrich-Heine-University, Medical Faculty, Düsseldorf, Germany (D.H.); and Department of Cell Biology and Immunology, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands (N.v.R.).