1. Department of Quantitative Health Sciences, Mayo Clinic , Rochester, Minnesota , USA
2. Department of Laboratory Medicine and Pathology, Mayo Clinic , Rochester, Minnesota , USA
3. Department of Neurology, Mayo Clinic , Rochester, Minnesota , USA
4. Department of Neurological Surgery, Institute of Human Genetics, University of California, San Francisco , San Francisco, California , USA
5. Center for MS and Autoimmune Neurology, Mayo Clinic , Rochester, Minnesota , USA