1. University of Mississippi, VA Medical Center, Jackson, MS, USA,
2. Mellen Center for Multiple Sclerosis Treatment and Research, The Cleveland Clinic Foundation, Cleveland, OH, USA
3. The Jacobs Neurological Institute, Buffalo General Hospital, Buffalo, New York, USA
4. The Multiple Sclerosis Center of Oregon, Oregon Health Sciences University, Portland, OR, USA
5. Oncovir, Inc., Washington, DC, USA
6. Georgetown University Medical Center, Washington, DC, USA
7. Providence Pacific Northwest Multiple Sclerosis Center, Portland, OR, USA
8. University of California San Francisco, Multiple Sclerosis Center, San Francisco, CA, USA
9. Biogen Idec, Inc., Cambridge, MA, USA