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Subjects
- Knee -- surgery[remove]3
- Ankylosis -- surgery1
- Forecasting1
- Humans1
- Medical Errors -- prevention & control1
- Medical Errors -- trends1
- Patella -- injuries1
- Pennsylvania1
- Process Assessment (Health Care)1
- Prospective Studies1
- Surgical Procedures, Operative -- adverse effects1
- Systems Analysis1
- Tuberculosis, Osteoarticular -- complications1
- United States1