[1] Kyoto Univ, Dept Pediat, Grad Sch Med, Kyoto, Kyoto, Japan
[2] Shiga Med Ctr Children, Dept Pediat, Moriyama Ku, Shiga, Japan
[3] Kyoto Univ, Inst Adv Study Human Biol ASHBi, Kyoto, Kyoto, Japan
[4] Nara Prefecture Gen Med Ctr, Dept Pediat, Nara, Japan
[5] Tokyo Med & Dent Univ, Grad Sch Med & Dent Sci, Dept Child Hlth & Dev, Tokyo, Japan