[1] Kumamoto Univ, Fac Life Sci, Dept Educ, Kumamoto, Japan
[2] Akita Univ, Grad Sch Med, Dept Environm Hlth Sci & Publ Hlth, Akita, Japan
[3] Kumamoto Univ, Fac Life Sci, Kumamot city, Japan
[4] Kumamoto Univ, Fac Humanities & Social Sci, Kumamoto, Japan