1. Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Shizuoka, Japan
2. Department of Surgery, Cumming School of Medicine, Calgary, AB, Canada
3. Department of Orthopaedic Surgery, Toronto Western Hospital, Schroeder Arthritis Institute, University of Toronto, Toronto, ON, Canada
4. Department of Orthopaedic Surgery, The University of Tokyo, Tokyo, Japan
5. Department of Orthopaedic Surgery, Duke University, Durham, NC, USA
6. Department of Orthopedic Spine Surgery, The Spine Hospital, Columbia University Medical Center, New York, NY, USA