1. Service of Neurology, Hospital Clinic; August Pi i Sunyer Biomedical Research Institute (IDIBAPS), University of Barcelona; Barcelona Spain
2. Institute of Clinical Chemistry, Neuroimmunology Unit and Department of Neurology; University Medical Center Schleswig-Holstein Campus; Kiel Germany
3. Catalan Institution for Research and Advanced Studies (ICREA); Barcelona Spain
4. Department of Neurology; University of Pennsylvania; Philadelphia Pennsylvania