1 Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London, United Kingdom.
2 Department of Neurology, David Geffen School of Medicine, Brain Research Institute, and Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, United States.
3 Department of Neurology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.