[1] Childrens Hosp Los Angeles, Div Emergency & Transport Med, 4650 Sunset Blvd,Mailstop 113, Los Angeles, CA 90027 USA
[2] Univ Southern Calif, Keck Sch Med, Dept Pediat, Los Angeles, CA 90007 USA
[3] Univ Southern Calif, Keck Sch Med, Dept Populat & Publ Hlth Sci, Los Angeles, CA USA
[4] Childrens Hosp Los Angeles, Div Clin Immunol & Allergy, Los Angeles, CA USA
[5] Childrens Hosp Los Angeles, Div Gen Pediat, Los Angeles, CA USA