3) Currie C, Nic Gabhainn S, Godeau E et al.:Inequalities in young people’s health:HBSC international report from the 2005/06 Survey. Health Policy for Children and Adolescents, No. 5, WHO Regional Office for Europe, Copenhagen, Denmark, 2008
4) Osaki Y, Tanihata T, Ohida T et al.:Decrease in the prevalence of smoking among Japanese adolescents and its possible causes:Periodic nationwide cross-sectional surveys. Environ Health Prev Med 13:219-226, 2008
5) Osaki Y, Tanihata T, Ohida T et al.:Decrease in the prevalence of adolescent alcohol use and its possible causes in Japan:Periodical nationwide cross-sectional surveys. Alcohol ClinExp Res 33:247-254, 2009