[1] Case Western Reserve Univ, MetroHlth Med Ctr, Dept Pediat, Cleveland, OH 44109 USA
[2] Newcastle Univ, Inst Genet Med, John Walton Muscular Dystrophy Res Ctr, Newcastle Upon Tyne, Tyne & Wear, England
[3] RTI Int, Res Triangle Pk, NC USA
[4] Duke Univ, Sch Med & Hlth Syst, Dept Orthopaed Surg, Durham, NC USA
[5] Seattle Childrens Hosp, Dept Rehabil Med, Seattle, WA USA
[6] Seattle Childrens Hosp, Dept Pediat, Seattle, WA USA
[7] Duke Univ, Sch Med, Dept Orthopaed, Phys Therapy Div, Durham, NC USA
[8] Ohio State Univ, Nationwide Childrens Hosp, Dept Pediat, Columbus, OH 43210 USA
[9] Childrens Hosp Eastern Ontario, Div Endocrinol & Metab, Ottawa, ON, Canada
[10] Univ Ottawa, Ottawa, ON, Canada
[11] SUNY Buffalo, John R Oishei Childrens Hosp, Buffalo, NY USA
[12] Ctr Dis Control & Prevent, Disorders & Hlth Outcomes Team, Natl Ctr Birth & Dev Disabil, Atlanta, GA USA
[13] Univ Rochester, Med Ctr, Golisano Childrens Hosp, Div Endocrinol & Diabet, Rochester, NY 14642 USA