[1] West Virginia Univ, Dept Anesthesia & Pediat, Morgantown, WV USA
[2] West Virginia Univ, Dept Family Med, Morgantown, WV USA
[3] West Virginia Univ, Dept Surg & Pediat, Morgantown, WV USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Dept Anesthesiol & Perioperat Med, Los Angeles, CA 90095 USA
[5] Univ Calif Los Angeles, David Geffen Sch Med, Dept Pediat, Los Angeles, CA 90095 USA
[6] Univ Calif Los Angeles, David Geffen Sch Med, Dept Anesthesiol, Los Angeles, CA 90095 USA
[7] Univ Calif Los Angeles, David Geffen Sch Med, Dept Psychiat, Los Angeles, CA 90095 USA
[8] Univ Calif Los Angeles, David Geffen Sch Med, Dept Biobehav Sci, Los Angeles, CA 90095 USA
[9] Boston Childrens Hosp, Dept Anesthesiol Perioperat & Pain Med, Med Acupuncture Serv, Boston, MA USA
[10] Harvard Med Sch, Boston, MA USA