[1] Univ Washington, Seattle Childrens Hosp, Canc & Blood Disorders Ctr, Seattle, WA 98195 USA
[2] Fred Hutchinson Canc Res Ctr, Treuman Katz Ctr Pediat Bioeth, Dept Pediat, Seattle, WA 98104 USA
[3] Dana Farber Canc Inst, Dept Psychosocial Oncol & Palliat Care, Boston, MA 02115 USA
[4] Boston Childrens Hosp, Dept Med, Boston, MA USA