- Correspondence to Professor Douglas S Goodin, Department of Neurology, University of California, San Francisco, UCSF MS Center, 675 Nelson Rising Lane, Suite #221D, San Francisco, CA 94158, USA;
- Received February 11, 2015
- Revised May 5, 2015
- Accepted May 7, 2015
- First published July 16, 2015.
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