[1] Univ Maryland, Sch Med, Dept Orthoped, 1 Texas Stn Ct,Suite 300, Baltimore, MD 21093 USA
[2] Univ Maryland, Sch Med, Dept Pediat, Baltimore, MD 21093 USA
[3] Univ Rochester, Dept Orthopaed & Rehabil, Rochester, NY USA
[4] Ohio State Univ, Wexner Med Ctr, Dept Plast & Reconstruct Surg, Div Hand Surg, Columbus, OH 43210 USA
[5] Shriners Hosp Children, Dept Hand & Upper Extrem, Philadelphia, PA USA
[6] Stanford Univ, Med Ctr, Dept Orthopaed Surg, Palo Alto, CA 94304 USA
[7] Northwestern Univ, Dept Clin Orthopaed Surg, Chicago, IL 60611 USA