1. Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Osaka, Japan
2. Department of Public Health, Osaka City University Graduate School of Medicine, Osaka, Japan
3. Department of Orthopaedic Surgery, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
4. Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
5. Department of Healthcare Management, College of Healthcare Management, Fukuoka, Japan