[1] Northwestern Univ, Feinberg Sch Med, Dept Orthoped Surg, Northwestern Mem Hosp, 676 North St Clair Suite 1350, Chicago, IL 60611 USA
[2] Univ Virginia Hlth Syst, Dept Orthoped Surg, Foot & Ankle Div, 400 Ray C Hunt Dr Suite 330, Charlottesville, VA 22908 USA