1. Department of Orthopedic Surgery, Shingu Municipal Medical Center
2. Department of Orthopedic Surgery, Wakayama Medical University
3. Spine Center, Nagoya Kyoritsu Hospital
4. Spine Center, Dokkyo Medical University Nikko Medical Center
5. Spine Care Center, Wakayama Medical University Kihoku Hospital
6. Department of Orthopedic Surgery, Sumiya Orthopaedic Hospital