1. Department of Orthopedic Surgery, The Permanente Medical Group, Walnut Creek, CA, USA
2. Medicine and Devices Surveillance Centre of Research Excellence Adelaide, University of South Australia, Adelaide, Australia
3. Department of Orthopedics and Sports Medicine, University of Washington, Seattle, WA, USA
4. Department of Surgical Outcomes and Analysis, Kaiser Permanente, San Diego, CA, USA
5. Department of Orthopedic Surgery, Southern California Permanente Medical Group, Baldwin Park, CA, USA