[1] Univ Arkansas Med Sci, Dept Pediat, Little Rock, AR 72205 USA
[2] Univ Arkansas Med Sci, Dept Anesthesiol, Little Rock, AR 72205 USA
[3] Univ Arkansas Med Sci, Dept Neurobiol, Little Rock, AR 72205 USA
[4] Univ Arkansas Med Sci, Dept Pharmacol, Little Rock, AR 72205 USA
[5] Wayne State Univ, Childrens Hosp Michigan, Dept Pediat Pharmacol & Pharmaceut Sci, Detroit, MI USA
[6] Wayne State Univ, Childrens Hosp Michigan, Eugene Applebaum Sch Pharm & Hlth Sci, Dept Pharmaceut, Detroit, MI USA
[7] Harvard Univ, Sch Med, Dept Anaesthesia, Div Pain Med, Boston, MA USA
[8] Harvard Univ, Sch Med, Dept Pediat, Div Pain Med, Boston, MA USA
[9] Harvard Univ, Sch Med, Childrens Hosp Boston, Dept Anesthesiol, Boston, MA USA
[10] US FDA, Ctr Drug Evaluat & Res, Off Counter Terrorism & Pediat Drug Dev, Rockville, MD 20857 USA
[11] Univ Calif San Diego, Dept Pediat, Pediat Pharmacol Res Unit, La Jolla, CA 92093 USA
[12] Univ Alabama Birmingham, Dept Pediat, Birmingham, AL USA
[13] Loyola Univ, Med Ctr, Dev Follow Up Program, Maywood, IL 60153 USA
[14] McGill Univ, Sch Nursing, Montreal, PQ, Canada
[15] Univ Chicago, Dept Pediat, MacLean Ctr Clin Med Eth, Robert Wood Johnson Clin Scholars Program, Chicago, IL 60637 USA
[16] Univ Chicago, Dept Med, MacLean Ctr Clin Med Eth, Robert Wood Johnson Clin Scholars Program, Chicago, IL 60637 USA
[17] Univ Washington, Sch Med, Childrens Hosp & Reg Med Ctr, Dept Anesthesiol & Pediat, Seattle, WA USA
[18] Univ Penn, Childrens Hosp Philadelphia, Dept Anesthesiol, Philadelphia, PA 19104 USA
[19] Univ British Columbia, BC Childrens Hosp, Div Dev Pediat, Vancouver, BC V5Z 1M9, Canada
[20] NICHHD, Pregnancy & Perinatol Branch, Ctr Dev Biol & Perinatal Med, Rockville, MD USA
[21] Hosp Sick Children, Dept Pharm, Toronto, ON M5G 1X8, Canada
[22] Hosp Sick Children, Populat Hlth Sci Res Inst, Toronto, ON M5G 1X8, Canada
[23] Univ Med & Dent New Jersey, Hackensack Univ Med Ctr, Dept Pediat, Newark, NJ USA