[1] Fukuoka Univ, Fac Med, Dept Publ Hlth, Fukuoka 8140180, Japan
[2] Univ Tokyo, Sch Publ Hlth, Dept Social & Prevent Epidemiol, Tokyo, Japan
[3] Natl Inst Hlth & Nutr, Nutrit Epidemiol Program, Tokyo, Japan
[4] Kyushu Univ, Grad Sch Med Sci, Dept Prevent Med, Div Social Med, Fukuoka, Japan
[5] Natl Ctr Child Hlth & Dev, Dept Med Specialties, Div Allergy, Tokyo, Japan
[6] Osaka City Univ, Sch Med, Dept Publ Hlth, Osaka 545, Japan
[7] Natl Inst Publ Hlth, Dept Technol Assessment & Biostat, Wako, Saitama 3510197, Japan