Institution: | 1. Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, California, USA;2. Department of Orthopaedic Surgery, University of California, Davis, Sacramento, California, USA;3. Department of Orthopaedic Surgery, Oregon Health and Science University, Portland, Oregon, USA;4. Department of Orthopaedic Surgery, Stanford University Medical Center, Palo Alto, California, USA;5. Department of Orthopaedic Surgery, Kaiser Oakland and South San Francisco, South San Francisco, California, USA |