[1] Univ Calif Irvine, Sch Med, Dept Anesthesiol & Perioperat Care, Irvine, CA USA
[2] Univ Calif Irvine, Ctr Stress & Hlth, Irvine, CA USA
[3] Childrens Hosp Orange Cty, Emergency Med, Orange, CA USA
[4] Yale Univ, Child Study Ctr, New Haven, CT USA
[5] Childrens Hosp Orange Cty, Orange, CA USA
[6] Univ Calif Irvine, Ctr Stress & Hlth, Dept Anesthesiol & Perioperat Care, 505S Main St, Suite 940, Orange, CA 92868 USA