1. 1) Science Council of Japan. https://www.scj.go.jp/ja/info/kohyo/17htm/1750z.html (Accessed Jan. 15, 2022) (in Japanese)
2. 2) Ministry of Education, Culture, Sports, Science and Technology. https://www.mext.go.jp/a_menu/kenko/hoken/1383847.htm (Accessed Jan. 15, 2022) (in Japanese)
3. 3) Health Survey of Musculoskeletal System. https://www.bjd-jp.org/wp/wp-content/uploads/2020/03/200313_health-survey.pdf (Accessed Jan. 15, 2022)
4. 4) Japan Sports Agency. https://www.mext.go.jp/sports/content/20210219-spt_kensport02-000012895_4.pdf (Accessed Jan. 15, 2022) (in Japanese)
5. 5) Hagino H, Yamamoto K, Ohshiro H, et al.: Increasing incidence of distal radius fractures in Japanese children and adolescents. J Orthop Sci, 2000, 5: 356–360.