1. Hayashino Y, Fukuhara S, Suzukamo Y, Okamura T, et al. (2007). Relation between sleep quality and quantity, quality of life, and risk of developing diabetes in healthy workers in Japan: The High-risk and Population Strategy for Occupational Health Promotion (HIPOP-OHP) Study. BMC Public Health .
2. Hayashino Y, Fukuhara S, Suzukamo Y, Okamura T, et al. (2007). Relation between sleep quality and quantity, quality of life, and risk of developing diabetes in healthy workers in Japan: the High-risk and Population Strategy for Occupational Health Promotion (HIPOP-OHP) Study. BMC Public Health 7(129).
3. Saito I, Okamura T, Fukuhara S, Tanaka T, et al. (2005). A cross-sectional study of alcohol drinking and health-related quality of life among male workers in Japan. Journal of Occupational Health 47(6):496-503.