[1] Univ Michigan, Sch Med, Dept Pediat, Div Neonatal Perinatal Med, Ann Arbor, MI USA
[2] Univ Michigan, CS Mott Childrens Hosp, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Ctr Bioeth & Social Sci Med, Ann Arbor, MI 48109 USA
[4] Harvard Med Sch, Dept Anesthesiol, Boston, MA 02115 USA
[5] Harvard Med Sch, Boston Childrens Hosp, Crit Care & Pain Med, Boston, MA 02115 USA
[6] Harvard Med Sch, Dept Anaesthesia, Boston, MA 02115 USA
[7] Univ Florida, Coll Med, Dept Pediat, Gainesville, FL USA
[8] Univ Florida, Coll Med, Dept Epidemiol, Gainesville, FL USA
[9] Boston Childrens Hosp, Dept Neurol, Boston, MA USA
[10] Univ Florida, Coll Med, Dept Pediat, Div Pediat Neurol, Gainesville, FL USA
[11] Univ Florida, Coll Med, Dept Neurol, Gainesville, FL 32611 USA
[12] Univ Florida, Coll Med, Dept Mol Genet & Microbiol, Gainesville, FL USA