1. Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan.
2. Department of Regional Medicine and Musculoskeletal Science, Gifu University Graduate School of Medicine, Gifu, Japan.
3. Division of Orthopaedic Surgery, Ibi Kousei Hospital, Gifu, Japan.
4. Spine Center, Matsunami General Hospital, Gifu, Japan.
5. Spine Center, Gifu Municipal Hospital, Gifu, Japan.
6. Advanced Critical Care Center, Gifu University Graduate School of Medicine, Gifu, Japan.