[1] Dana Farber Canc Inst, Dept Pediat Oncol, Boston, MA USA
[2] Dana Farber Canc Inst, Dept Psychosocial Oncol & Palliat Care, Boston, MA USA
[3] Washington Univ, Sch Med, St Louis, MO USA
[4] Dana Farber Canc Inst, Survey & Data Management Core, Boston, MA USA
[5] Boston Childrens Hosp, Dept Pediat, Boston, MA USA
[6] Harvard Med Sch, Dept Pediat, Boston, MA USA
[7] Univ Michigan, Univ Michigan Med Sch, Ann Arbor, MI USA
[8] Dana Farber Boston Children Canc & Blood Disorders, 450 Brookline Ave St, Boston, MA 02115 USA