[1] Univ Chicago, Med Ctr, Dept Orthopaed Surg & Rehabil Med, Chicago, IL 60637 USA
[2] Blue Ridge Bone & Joint Clin, Asheville, NC USA
[3] Univ Pittsburgh UPMC, Ctr Sports Med, Div Shoulder Surg & Sports Med, Pittsburgh, PA USA
[4] Massachusetts Gen Hosp, Harvard Shoulder Serv, Boston, MA 02114 USA