[1] Univ Victoria, Div Med Sci, POB 1700 STN CSC, Victoria, BC V8W 2Y2, Canada
[2] Texas Womans Univ, Scottish Rite Children, Dallas, TX USA
[3] Johns Hopkins Sch Nursing, Baltimore, MD USA
[4] Sch Med, Baltimore, MD USA
[5] Northwestern Univ, Feinberg Sch Med, Dept Phys Therapy & Human Movement Sci, Chicago, IL USA
[6] Emmes Co, Rockville, MD USA
[7] NINDS, Div Clin Res, NIH, Bethesda, MD USA
[8] Mayo Clin, Dept Phys Med & Rehabil, Rochester, MN USA
[9] Mayo Clin, Dept Pediat & Adolescent Med, Rochester, MN USA