(参考:Rumiko Hayashi, Motoki Iwasaki, Tetsuya Otani, Naren Wang, Hiroko Miyazaki, Sasazawa Yoshiaki, Shigenobu Aoki, Hiroshi Koyama and Shosuke Suzuki:“Body Mass Index and Mortality in a Middle-aged Japanese Cohort”. Journal of Epidemiology, Vol. 15, pp.70-77 (2005) .)(http://www.jstage.jst.go.jp/article/jea/15/3/70/_pdf/-char/ja/)