1. Department of Microbiology and Molecular Genetics, Medical College of Wisconsin, Milwaukee, Wisconsin.
2. Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin.
3. Neuro-Immunology Laboratory and Multiple Sclerosis Clinic, Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada.
4. Biogen Idec Canada, Toronto, Canada.
5. Division of Biostatistics, Medical College of Wisconsin, Milwaukee, Wisconsin.