1. Department of Orthopaedic Surgery, Kaiser Permanente South Bay Medical Center, Harbor City, CA, USA.
2. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, CA, USA.
3. Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY, USA.
4. Torrance Orthopaedic and Sports Medicine Group, Torrance, CA, USA.
5. Kaiser Permanente Baldwin Park Medical Center, Baldwin Park, CA, USA.