1 Institute of Neuropathology, University Medical Center, Göttingen, Germany.
2 Department of Neurosciences, Centre de recherche de l'Université de Montréal (CRCHUM), Montréal, Québec, Canada.
3 Institute of Clinical Chemistry, Laboratory Medicine and Transfusion Medicine, Nuremberg General Hospital, Paracelsus Medical University, Nuremberg, Germany.
4 LaborDiagnostik-Karlsruhe GmbH, Clinical Mass Spectrometry, Karlsruhe, Germany.
5 Department of Geriatrics, Evangelisches Krankenhaus Göttingen-Weende, Göttingen, Germany.
6 Department of Neurology, University of California, San Francisco, CA, USA.
7 Department of Neurology, University Medical Center, Göttingen, Germany.