1. Department of Orthopaedic Surgery, International University of Health and Welfare Narita Hospital
2. Department of Orthopaedic Surgery, School of Medicine, International University of Health and Welfare
3. Department of Orthopaedic Surgery and Spine and Spinal Cord Center, International University of Health and Welfare Mita Hospital
4. Department of Orthopaedic Surgery, Keio University School of Medicine