[1] Univ Texas Southwestern, Dept Neurol, Dept Pediat, Dallas, TX 75390 USA
[2] Univ Utah, Data Coordinating & Anal Ctr, Salt Lake City, UT USA
[3] Washington Univ, St Louis, MO 63110 USA
[4] Univ Alabama Birmingham, Birmingham, AL USA
[5] Univ Texas Southwestern, Dept Neurol, Dallas, TX USA
[6] Washington Univ, Dept Radiol, St Louis, MO 63110 USA
[7] SUNY Buffalo, Jacobs Pediat Multiple Sclerosis Ctr, Buffalo, NY USA
[8] Mayo Clin, Pediat Multiple Sclerosis Ctr, Rochester, MN USA
[9] Loma Linda Univ, Childrens Hosp, Pediat Multiple Sclerosis Ctr, Loma Linda, CA 92350 USA
[10] Stony Brook Univ Hosp, Lourie Ctr Pediat Multiple Sclerosis, Stony Brook, NY USA
[11] Univ Calif Berkeley, Epidemiol, Berkeley, CA 94720 USA
[12] Univ Utah, Dept Neurol, Salt Lake City, UT USA
[13] Boston Childrens Hosp, Pediat Multiple Sclerosis & Related Disorders Pro, Boston, MA USA
[14] Univ Utah, Primary Childrens Hosp, Salt Lake City, UT USA
[15] Massachusetts Gen Hosp, Partners Pediat Multiple Sclerosis Ctr, Boston, MA 02114 USA
[16] Univ Alabama Birmingham, Childrens Hosp Alabama, Ctr Pediat Onset Demyelinating Dis, Birmingham, AL USA
[17] Childrens Natl Med Ctr, Washington, DC 20010 USA
[18] Univ Calif San Francisco, Pediat Multiple Sclerosis Ctr, San Francisco, CA 94143 USA
[19] Texas Childrens Hosp, Baylor Coll Med, Blue Bird Circle Clin Multiple Sclerosis, Houston, TX 77030 USA
[20] Cleveland Clin, Mellen Ctr Multiple Sclerosis, Cleveland, OH 44106 USA
[21] Lurie Childrens Hosp Chicago, Chicago, IL USA
[22] Univ Colorado Denver, Childrens Hosp Colorado, Rocky Mt Multiple Sclerosis Ctr, Aurora, CO USA
[23] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[24] NYU, Pediat Multiple Sclerosis Ctr, New York, NY 10003 USA
[25] Univ Calif San Diego, Pediat Multiple Sclerosis Ctr, La Jolla, CA 92093 USA