As this is a very specific question, I suggest that you contact one of the the following organizations and request information directly from them.
Multiple Sclerosis Association of America
706 Haddonfield Road
Cherry Hill, NJ 08002
webmaster@msaa.com
www.msassociation.org
Tel: 856-488-4500 800-532-7667
Fax: 856-661-9797
Multiple Sclerosis Foundation
6350 North Andrews Avenue
Ft. Lauderdale, FL 33309-2130
support@msfocus.org
http://www.msfocus.org
Tel: 954-776-6805 888-MSFOCUS (673-6287)
Fax: 954-351-0630
Accelerated Cure Project for Multiple Sclerosis
300 Fifth Avenue
Waltham, MA 02451
info-ninds08@acceleratedcure.com
http://www.acceleratedcure.org
Tel: 781-487-0008
Fax: 781-487-0009
National Multiple Sclerosis Society
733 Third Avenue
6th Floor
New York, NY 10017-3288
nat@nmss.org
http://www.nationalmssociety.org
Tel: 212-986-3240 800-344-4867 (FIGHTMS)
Fax: 212-986-7981
American Autoimmune Related Diseases Association
22100 Gratiot Avenue
Eastpointe
East Detroit, MI 48201-2227
aarda@aarda.org
http://www.aarda.org
Tel: 586-776-3900 800-598-4668
Fax: 586-776-3903
National Rehabilitation Information Center (NARIC)
4200 Forbes Boulevard
Suite 202
Lanham, MD 20706-4829
naricinfo@heitechservices.com
http://www.naric.com
Tel: 301-459-5900/301-459-5984 (TTY) 800-346-2742
Fax: 301-562-2401
Clearinghouse on Disability Information
Special Education & Rehabilitative Services Communications & Customer Service Team
550 12th Street, SW, Rm. 5133
Washington, DC 20202-2550
http://www.ed.gov/about/offices/list/osers
Tel: 202-245-7307 202-205-5637 (TTD)
Fax: 292024507636
National Ataxia Foundation (NAF)
2600 Fernbrook Lane North
Suite 119
Minneapolis, MN 55447-4752
naf@ataxia.org
http://www.ataxia.org
Tel: 763-553-0020
Fax: 763-553-0167
National Organization for Rare Disorders (NORD)
P.O. Box 1968
(55 Kenosia Avenue)
Danbury, CT 06813-1968
orphan@rarediseases.org
http://www.rarediseases.org
Tel: 203-744-0100 Voice Mail 800-999-NORD (6673)
Fax: 203-798-2291