1. Pain Management Center, National Hospital Organization Shikoku Medical Center for Children and Adults, Zentsuji, Japan
2. Department of Orthopaedic Surgery, Kochi Medical School, Kochi University, Nankoku, Japan
3. Division of Radiology, Kochi Medical School Hospital, Kochi University, Nankoku, Japan
4. Division of Radiology, Kochi Sougou Rehabilitation Hospital, Kochi, Japan
5. Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan