[1] Univ Utah, Sch Med, Dept Pediat, Div Neonatol, Salt Lake City, UT 84132 USA
[2] Univ Utah, Sch Med, Dept Pediat, Div Pediat Neurol, Salt Lake City, UT USA
[3] Duke Univ, Med Ctr, Div Neonatol, Durham, NC USA
[4] Weill Cornell Med Coll, Div Pediat Crit Care Med, New York, NY USA
[5] Univ Utah, Sch Med, Dept Pediat, Div Pediat Crit Care, Salt Lake City, UT USA