[1] Kyoto Prefectural Univ Med, Dept Pediat, Kyoto, Japan
[2] Osaka City Gen Hosp, Childrens Med Ctr, Div Pediat Endocrinol & Metab, 2-13-22 Miyakojima Hondori, Miyakojima, Osaka 5340021, Japan
[3] Kyoto Prefectural Univ Med, Dept Pediat Surg, Kyoto, Japan
[4] Kyoto Saiseikai Hosp, Dept Pediat, Kyoto, Japan
[5] Univ Fukui, Fac Med Sci, Dept Pediat, Fukui, Japan
[6] Natl Ctr Child Hlth & Dev, Dept Gen Pediat & Interdisciplinary Med, Tokyo, Japan