1. Department of Orthopaedic Surgery, Osaka City University Faculty of Medicine
2. Department of Public Health, Osaka City University Faculty of Medicine
3. Department of Orthopaedic Surgery, Kyushu University
4. Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
5. Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine