[1] Hokkaido Univ, Inst Med Genet, Signaling Canc & Immunol, Sapporo, Hokkaido, Japan
[2] Teine Keijinkai Hosp, Dept Pediat, Sapporo, Hokkaido, Japan
[3] Hokkaido Univ Hosp, Div Clin Canc Genom, Sapporo, Hokkaido, Japan
[4] Hokkaido Univ, Dept Pediat, Grad Sch Med, Sapporo, Hokkaido, Japan
[5] Univ Edinburgh, Queens Med Res Inst, Edinburgh, Midlothian, Scotland