[1] Univ Washington, Dept Pediat, Div Hematol Oncol, Sch Med, Seattle, WA 98195 USA
[2] Univ Washington, Dept Pediat, Div Rheumatol, Sch Med, Seattle, WA USA
[3] Univ Washington, Dept Hlth Syst & Populat Hlth, Sch Publ Hlth, Seattle, WA USA
[4] Univ Washington, Dept Epidemiol, Sch Publ Hlth, Seattle, WA USA
[5] Univ Washington, CHOICE Inst, Hlth Econ & Outcomes Res, Sch Pharm, Seattle, WA USA
[6] Seattle Childrens Res Inst, Core Biostat Epidemiol & Analyt Res, Seattle, WA USA
[7] Fred Hutchinson Canc Ctr, Publ Hlth Sci Div, Seattle, WA USA
[8] Dana Farber Canc Inst, Dept Psychosocial Oncol & Palliat Care, Boston, MA USA
[9] Boston Childrens Hosp, Pediat Palliat Care Program, Boston, MA USA
[10] Harvard Med Sch, Dept Pediat, Boston, MA USA