1. MS Comprehensive Care Center, SUNY at Stony Brook, New York, NY, USA,
2. MS Clinic, Ottawa General Hospital, Ottawa, Ontario, Canada
3. Colorado Springs Neurological Associates and MS Center of Southern Colorado, Colorado Springs, CO, USA
4. James Q. Miller MS Clinic, University of Virginia, Charlottesville, VA, USA
5. Reed Neurological Research Center, UCLA School of Medicine, Los Angeles, CA, USA
6. Louisiana State University Health Science, New Orleans, LA, USA
7. Department of Neurology, Ohio State University, Columbus, OH, USA
8. Department of Neurology, Buffalo General Hospital, Buffalo, NY, USA
9. University of Kansas Medical Center and Teva Neuroscience, Kansas City, MO, USA