[1] Loma Linda Univ, Dept Emergency Med, Med Ctr, Loma Linda, CA 92354 USA
[2] Univ Florida, Dept Emergency Med, Coll Med Jacksonville, Jacksonville, FL USA
[3] Med Univ South Carolina, Div Pediat Emergency Med, Charleston, SC 29425 USA
[4] Duke Univ, Dept Nursing, Durham, NC USA
[5] Univ Colorado, Dept Pediat, Sch Med, Aurora, CO USA