Institution: | (1) Department of Orthopaedic Surgery, Hospital of the University of Pennsylvania, 2nd Floor, Silverstein Building, Philadelphia, PA 19104, USA;(2) Department of Orthopaedic Surgery, Keck School of Medicine, University of Southern California, LAC + USC Medical Center, Los Angeles, CA, USA;(3) Keck School of Medicine, University of Southern California, LAC + USC Medical Center, Los Angeles, CA, USA; |