1. Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
2. All Japan Judo Federation Medical Committee, Tokyo, Japan
3. Division of Colorectal Surgery, Tobu Chiiki hospital, Tokyo Metropolitan Health and Medical Treatment Corporation, Tokyo, Japan
4. Department of Orthopaedic Surgery, Tokai University School of Medicine, Kanagawa, Japan
5. Department of Orthopaedics, Japan Community Healthcare Organization, Tokyo Shinjuku Medical Center, Tokyo, Japan
6. School of Physical Education, Tokai University, Kanagawa, Japan
7. International Judo Federation Medical Commission, Tokyo, Japan
8. Department of Musculoskeletal Disorders, Faculty of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy
9. Centre of Sports and Exercise Medicine, Queen Mary University of London, London, UK
10. Institute of Science and Technology in Medicine, Keele University School of Medicine, Stoke on Trent, England
11. Department of Neurosurgery, Tokushima University, Tokushima, Japan