Institution: | 1. Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, NY, USA 2. Epidemiology and Biostatistics Core, Hospital for Special Surgery, 535 E 70th Street, New York, NY, 10021, USA 3. Department of Orthopaedic Surgery and Philip R. Lee Institute for Health Policy Studies, University of California San Francisco, San Francisco, CA, USA
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