1. Kawai, T.: School hygiene in Arthur Newsholme: hygienization, government, and morality. Reg. Stud. Bull. Fac. Reg. Stud. Tottori Univ. 12(2), 61–74 (2015)
2. Statistics Bureau, Ministry of Internal Affairs and Communications in Japan Homepage, Population Projection in Japan (Current as of 1 July 2021 (Constant value)). https://www.stat.go.jp/data/jinsui/new.html. Accessed 18 Jan 2022
3. Kubota, K.: The Hand and the Brain, Revised and Updated Edition, pp. 174–175. Kinokuniya Bookstore, Japan (2010)
4. ZEBRA Homepage. https://www.zebra.co.jp/press/news/2016/0411.html. Accessed 18 Jan 2022
5. Oshiki, H., Kondoh, S., Hashimoto, A.: Desirable ways of holding writing instruments, their rationality and verification methods. Writ. Calligraphy Educ. Res. 17, 11–20 (2003)