[1] Cincinnati Childrens Hosp Med Ctr, Div Pain, Dept Anesthesiol, Pediat Palliat & Comfort Care Team, Cincinnati, OH 45229 USA
[2] Cincinnati Childrens Hosp Med Ctr, Canc & Blood Dis Inst, Dept Pediat, Cincinnati, OH 45229 USA
[3] Univ Texas SW Med Ctr Dallas, Dept Clin Sci, Dallas, TX 75390 USA
[4] Univ Texas SW Med Ctr Dallas, Pauline Allen Gill Ctr Canc & Blood Disorders, Dept Pediat, Dallas, TX 75390 USA
[5] Univ Texas SW Med Ctr Dallas, Harold C Simmons Canc Ctr, Dallas, TX 75390 USA
[6] Childrens Med Ctr, Dallas, TX 75235 USA