[1] Univ Tokyo, Dept Pediat, Tokyo, Japan
[2] Natl Res Inst Child Hlth & Dev, Dept Maternal Fetal Biol, Tokyo, Japan
[3] Kyoto Univ, Grad Sch Med, Dept Pathol & Tumor Biol, Kyoto, Japan
[4] Univ Tokyo, Inst Med Sci, Human Genome Ctr, Lab DNA Informat Anal, Tokyo, Japan
[5] Kanagawa Childrens Med Ctr, Div Pathol, Yokohama, Kanagawa, Japan
[6] Japanese Red Cross Gunma Blood Ctr, Gunma, Japan