1. 1) Sato N, Yoshiike N. 2010. Factors associated with the masticatory behavior of children assessed by the number of chews for a test meal of usual school lunch menu. Eiyogaku Zasshi (Jpn J Nutr Diet) 68: 253-262 (in Japanese with English summary).
2. 2) Ikiuo K, Hashimoto R, Murata M. 2009. Discussion on the new physical fitness definition in school health program. Shonihoken Kenkyu (J Child Health) 6: 6-13 (in Japanese with English summary).
3. 3) Maki K, Takaetsu N, Ueda H, Kaku A, Kodama S, Takamine A, Yamano H, Kimura M. 1992. A study on the measurement of the biting pressure and masticatory efficiency in children. Shoni Shikagaku Zasshi (Jpn J Pediatr Dent) 30: 590-597 (in Japanese with English summary).
4. 4) Ogata K, Karibe H, Kikuchi S. 1996. Assessment of the occlusal force in children utilizing the “dental prescale”. Shoni Shikagaku Zasshi (Jpn J Pediatr Dent) 34: 856-864 (in Japanese with English summary).
5. 5) Sato N, Yoshiike N. 2010. Investigations of the measurement by a portable chewing counter for children. Eiyogaku Zasshi (Jpn J Nutr Diet) 68: 213-219 (in Japanese with English summary).