[1] Univ Arkansas Med Sci, Arkansas Childrens Hosp, Dept Pediat, Div Neurol, Little Rock, AR 72205 USA
[2] Johns Hopkins Sch Med, Ctr Genet Muscle Disorders, Baltimore, MD USA
[3] Johns Hopkins Sch Med, Kennedy Krieger Inst, Baltimore, MD USA
[4] Johns Hopkins Sch Med, Dept Neurol, Baltimore, MD USA
[5] Johns Hopkins Sch Med, Dept Neurosci, Baltimore, MD USA
[6] Univ Colorado, Sch Med, Dept Phys Med & Rehabil, Aurora, CO USA
[7] Univ Calif Davis Hlth Syst, Dept Phys Med & Rehabil, Sacramento, CA USA
[8] Univ Calif Davis Hlth Syst, Dept Pediat, Sacramento, CA USA
[9] Univ Iowa, Dept Pediat, Carver Coll Med, Iowa City, IA 52242 USA
[10] Univ Colorado, Sch Med, Dept Neurol & Pediat, Aurora, CO USA
[11] Univ Massachusetts, Med Sch, Dept Pediat & Neurol, Worcester, MA USA
[12] Univ Rochester, Med Ctr, Dept Neurol, 601 Elmwood Ave,POB 673, Rochester, NY 14642 USA
[13] Univ Calif Los Angeles, Dept Neurol, Los Angeles, CA 90024 USA
[14] Univ Utah, Sch Med, Dept Pediat & Neurol, Salt Lake City, UT USA
[15] Northwestern Univ, Dept Pediat, Ann & Robert H Lurie Childrens Hosp Chicago, Div Neurol,Feinberg Sch Med, Chicago, IL 60611 USA
[16] Duke Univ, Med Ctr, Dept Pediat, Div Neurol, Durham, NC 27710 USA
[17] Childrens Hosp Kings Daughters, Dept Pediat, Div Neurol, Norfolk, VA USA
[18] Ohio State Univ, Coll Med, Dept Pediat, Div Neurol,Nationwide Childrens Hosp, Columbus, OH 43210 USA