[1] Akron Childrens Hosp, Rebecca D Considine Res Inst, Akron, OH 44308 USA
[2] Akron Childrens Hosp, Haslinger Family Pediat Palliat Care Ctr, Akron, OH 44308 USA
[3] Nationwide Childrens Hosp, Div Hosp & Palliat Med, Dept Pediat, Columbus, OH USA
[4] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA
[5] Cincinnati Childrens Hosp Med Ctr, Div Biostat & Epidemiol, Cincinnati, OH 45229 USA
[6] Cincinnati Childrens Hosp Med Ctr, Dept Anesthesiol, Div Palliat Care, Cincinnati, OH USA