[1] Oregon Hlth & Sci Univ, Dept Orthopaed & Rehabil, Portland, OR 97201 USA
[2] Univ Hosp Geneva, Div Orthopaed & Trauma Surg, Geneva, Switzerland
[3] Appalachain Orthopaed Associates, Kingsport, TN USA
[4] San Antonio Orthopaed Grp LLP, San Antonio, TX 78259 USA