[1] Childrens Hosp Los Angeles, Dept Pediat, Los Angeles, CA 90027 USA
[2] Childrens Hosp Los Angeles, Div Emergency & Transport Med, 4650 Sunset Blvd,Mailstop 113, Los Angeles, CA 90027 USA
[3] Univ Southern Calif, Dept Pediat, Keck Sch Med, Los Angeles, CA USA