[1] Harvard Univ, Sch Med, Dana Farber Canc Inst, Dept Pediat Oncol, Cambridge, MA 02138 USA
[2] Harvard Univ, Sch Med, Dana Farber Canc Inst, Dept Adult Oncol, Cambridge, MA 02138 USA
[3] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Med, Boston, MA 02115 USA
[4] Washington Univ, Sch Med, Dept Med, Div Oncol, St Louis, MO 63110 USA
[5] Johns Hopkins Univ, Div Pediat Hematol, Baltimore, MD 21205 USA
[6] Decode Genet, IS-110 Reykjavik, Iceland