[1] Natl Ctr Child Hlth & Dev, Res Inst, Dept Hlth Policy, Tokyo, Japan
[2] Juntendo Univ, Sch Med, Dept Gen Med, Tokyo, Japan
[3] Natl Ctr Child Hlth & Dev, Natl Med Ctr Children & Mothers, Div Endocrinol & Metab, Tokyo, Japan
[4] Nihon Univ, Sch Med, Dept Pediat & Child Hlth, Tokyo 102, Japan
[5] Kiryu Univ, Fac Hlth Care, Dept Nutr, Gunma, Japan