[1] Childrens Natl Hlth Syst, Div Anesthesiol Pain & Perioperat Med, 111 Michigan Ave NW, Washington, DC 20010 USA
[2] George Washington Univ, Sch Med & Hlth Sci, Washington, DC 20052 USA
[3] Childrens Natl Hlth Syst, Med Genet Res Ctr, Washington, DC USA
[4] Princeton Univ, Med Princeton Internship Civ Serv, Childrens Natl Hlth Syst, Washington, DC USA
[5] Univ Calif Irvine, Dept Anesthesiol & Perioperat Care, Irvine, CA USA
[6] Univ Calif Irvine, Dept Pediat, Irvine, CA 92717 USA
[7] Univ Calif Irvine, Dept Psychiat, Irvine, CA 92717 USA
[8] Childrens Natl Hlth Syst, Div Orthoped Surg & Sports Med, Washington, DC USA