University of California, San Francisco (UCSF) - Weill Institute for Neurosciences, Loma Linda University - Department of Pediatrics, University of California, San Francisco (UCSF) - Weill Institute for Neurosciences, NYU Grossman - Department of Neurology, Harvard University - Department of Neurology, Harvard University - Department of Neurology, Harvard University - Department of Neurology, Harvard University - Department of Neurology, University of California, San Diego (UCSD) - Department of Neurology, University of Alabama at Birmingham - Department of Nursing, Texas Children’s Hospital - Department of Neurology, Washington University in St. Louis - Department of Neurology, Mayo Clinic - Department of Neurology, University of Utah - Department of Neurology, University of Colorado, Aurora - Department of Neurology & Pediatrics, State University of New York (SUNY) - Department of Neurology, University of Utah - Department of Pediatrics, University of Utah - Department of Pediatrics and University of California, San Francisco (UCSF) - Weill Institute for Neurosciences

Washington University in St. Louis, Washington University in St. Louis - Department of Neurology, University of Utah - Department of Pediatrics, University of Utah - Department of Pediatrics, Mayo Clinic - Department of Neurology and Laboratory Medicine and Pathology and the Center for MS and Autoimmune Neurology, Loma Linda University - Department of Pediatrics, Harvard University - Department of Neurology, Harvard University - Department of Neurology, UCSF Regional Pediatric MS Center, Harvard University - Pediatric Multiple Sclerosis and Related Disorders Program at Boston Children’s Hospital, Washington University Pediatric MS and other Demyelinating Disease Center, Rady Children's Hospital - University of California San Diego Health, University of Texas Southwestern and Children’s Health - Department of Neurology, UCSF Regional Pediatric MS Center, New York University (NYU) - Neurology, Texas Children’s Hospital - Department of Neurology, University of Pennsylvania - Children's Hospital of Philadelphia, Mayo Clinic - Department of Neurology and Laboratory Medicine and Pathology and the Center for MS and Autoimmune Neurology, Cleveland Clinic - Mellen Center for Multiple Sclerosis, Mayo Clinic - Department of Neurology, University of Utah - Department of Neurology, University of Colorado, Aurora - Department of Neurology & Pediatrics, Mayo Clinic - Mayo Clinic Pediatric MS Center, University of Pennsylvania - Children's Hospital of Philadelphia, State University of New York (SUNY) - Department of Neurology, University of Alabama at Birmingham - Department of Nursing, University of California, San Francisco (UCSF) - Weill Institute for Neurosciences, Mayo Clinic - Department of Neurology and Laboratory Medicine and Pathology and the Center for MS and Autoimmune Neurology and Independent

KU Leuven - ESAT-STADIUS, Hasselt University, Ghent University, Ghent University, Ghent University, affiliation not provided to SSRN, Ghent University, affiliation not provided to SSRN, affiliation not provided to SSRN, Ghent University, Ghent University, Ghent University, Ghent University, Ghent University, Charles University and General University Hospital - Department of Neurology and Center of Clinical Neuroscience, University of Catania, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Montreal, University of Montreal - Neuroimmunology Research Laboratory, University of Bologna, affiliation not provided to SSRN, University of Melbourne - CORe, affiliation not provided to SSRN, affiliation not provided to SSRN, Box Hill Hospital, 19 Mayis University, affiliation not provided to SSRN, Zuyderland Medical Centre, American University of Beirut, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, State University of New York (SUNY) - Department of Neurology, Universitat de Barcelona, affiliation not provided to SSRN, affiliation not provided to SSRN, Ente Ospedaliero Ospedali Galliera, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Guilan University of Medical Sciences - Razi Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, Monash University - Department of Neuroscience, affiliation not provided to SSRN, Reina Sofia University Hospital, Koç University, Sultan Qaboos University, Groene Hart Ziekenhuis, affiliation not provided to SSRN, University of Debrecen, South Western Sydney Local Health District - Liverpool Hospital, affiliation not provided to SSRN, affiliation not provided to SSRN, Royal Hobart Hospital, affiliation not provided to SSRN, University of Geneva - Geneva University Hospitals, affiliation not provided to SSRN, affiliation not provided to SSRN, Perron Institute for Neurological and Translational Science, Hospital General Universitario de Alicante, affiliation not provided to SSRN, Semmelweis University, The University of Sydney - Concord Repatriation General Hospital, affiliation not provided to SSRN, Royal Victoria Hospital, Department of Neurology, Aristotle University of Thessaloniki, affiliation not provided to SSRN, Mater Dei Hospital, KU Leuven - ESAT-STADIUS and Hasselt University - Data Science Institute