1. Department of Orthopaedic Surgery, Stanford University, Redwood City, CA, USA
2. Department of Bioengineering, Stanford University, Stanford, CA, USA
3. Department of Orthopaedics, Palacký University Olomouc, Olomouc, Czech Republic
4. Department of Orthopaedic Surgery, University of Florida, Gainesville, FL, USA
5. Department of Orthopaedic Surgery, Yamagata University, Yamagata, Japan