1. Department of Neurology, Mayo Clinic, Rochester, MN
2. Department of Clinical Neurological Sciences, London Health Sciences Centre, London, ON, Canada
3. Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
4. Department of Pathology and Laboratory Medicine, London Health Sciences Centre, London, ON, Canada
5. Center for MS and Autoimmune Neurology, Mayo Clinic, Rochester, MN