[1] Seattle Childrens Hosp, Dept Rehabil Med, 4800 Sand Point Way NE, Washington, DC 98105 USA
[2] Duke Univ, Med Ctr, Dept Orthopaed Surg, Durham, NC USA
[3] Case Western Reserve Univ, MetroHlth Med Ctr, Cleveland, OH USA
[4] Duke Univ Hlth Syst, Dept Orthoped Surg, Durham, NC USA
[5] Nemours Alfred I Dupont Hosp Children, Wilmington, DE USA
[6] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH 45229 USA
[7] Shriners Hosp Children, Portland, OR 97201 USA