1. Sekizawa, K.: Treatment and prevention for pneumonia by erroneous deglutition. Japan. Soc. Intern. Med. 87(2), 292–296 (1998)
2. Ministry of Health, Labour and Welfare: Deaths from accidents by age (5-year age groups) and external causes (the list of three-character categories): Japan, Vital Statistics of Japan. https://www.e-stat.go.jp/dbview?sid=0003411675
3. Japanese Society for Mastication Science and Health Promotion. http://sosyaku.umin.jp/info/file/info01.pdf
4. Japan Prosthodontic Society. https://www.hotetsu.com/s/doc/GAIDE-04_21651.pdf
5. Harada, K., Kawahito, S., Tadokoro, Y.: A counting system of the chewing number using pressure sensors. T. SICE 33, 1–7 (1997)