[1] Connecticut Childrens Med Ctr, Dept Pediat, Div Neonatol, Hartford, CT 06106 USA
[2] Univ Connecticut, Sch Med, Farmington, CT 06269 USA
[3] Northwestern Univ, Feinberg Sch Med, Dept Pediat, Chicago, IL USA
[4] Ann & Robert H Lurie Childrens Hosp Chicago, Dept Pediat, Chicago, IL USA
[5] Cincinnati Childrens Hosp Med Ctr, Div Neonatal & Pulm Biol, Cincinnati, OH USA
[6] Cincinnati Childrens Hosp Med Ctr, Div Pain & Palliat Med, Cincinnati, OH USA
[7] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA
[8] Univ Cincinnati, Coll Med, Dept Anesthesiol, Cincinnati, OH USA
[9] Ann & Robert H Lurie Childrens Hosp Chicago, Div Neonatol, Chicago, IL USA
[10] Ann & Robert H Lurie Childrens Hosp Chicago, Div Palliat Care, Chicago, IL USA
[11] Univ Michigan, Dept Pediat, Med Sch, Michigan Med, Ann Arbor, MI USA
[12] Childrens Natl Med Ctr, Dept Pediat, Pediat Palliat Care Team, Washington, DC USA
[13] Nemours Childrens Hosp Delaware, Div Neonatol, Wilmington, DE USA
[14] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Pediat, Philadelphia, PA USA
[15] Univ Wisconsin, Sch Med & Publ Hlth, Madison, WI USA