1. Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, CA, USA
2. Department of Orthopedic Surgery, Long Beach Lakewood Orthopedic Institute, Long Beach, CA, USA
3. Department of Orthopedic Surgery, Newport Orthopedic Institute, Newport Beach, CA, USA
4. Department of Orthopedic Surgery, Kaiser Permanente South Bay Medical Center, Harbor City, CA, USA