[1] Childrens Hosp & Clin Minnesota, Palliat Care & Integrat Med, Dept Pain Med, 2525 Chicago Ave South, Minneapolis, MN 55404 USA
[2] Univ Minnesota, Dept Pediat, Minneapolis, MN 55455 USA
[3] Dana Farber Canc Inst, Boston, MA 02115 USA
[4] Boston Childrens Hosp, Boston, MA USA
[5] Univ Minnesota, Sch Social Work, St Paul, MN 55108 USA
[6] Northwestern Feinberg Sch Med, Dept Med Palliat Med, Chicago, IL USA
[7] Jesse Brown VA Med Ctr, Chicago, IL USA
[8] Univ Minnesota, Sch Publ Hlth, Minneapolis, MN USA