2 Neurology, Mayo Clinic, Rochester, MN 55905, USA.
3 Department of Neurology, Istanbul University Cerrahpasa School of Medicine, Istanbul 34098, Turkey.
4 Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
5 The University of Texas Southwestern Medical Center, Neuroinnovation Program, Multiple Sclerosis, and Neuroimmunology Imaging Program, Dallas, TX 75390, USA.