Affiliation: | a Lancaster Orthopedic Group, Lancaster, Pennsylvania, U.S.A. b Morgan Kalman Clinic, Wilmington, Delaware, U.S.A. c Orthopedic Specialists of New Jersey, Hackensack, New Jersey, U.S.A. d Booth, Bartolozzi, Balderston Orthopaedics, Philadelphia, Pennsylvania, U.S.A. |