1. University Orthopaedic Center, University of Utah, Salt Lake City, Utah, USA
2. Shanghai Institute of Traumatology and Orthopaedics, Orthopaedic Department, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
3. University of New Mexico, Albuquerque, New Mexico, USA
4. University of South Carolina, Columbia, South Carolina, USA