[1] Univ Calif San Diego, Sch Med, Dept Emergency Med, San Diego, CA 92103 USA
[2] Univ Calif San Diego, Dept Pediat, Sch Med, San Diego, CA 92103 USA
[3] Univ Colorado, Sch Med, Dept Pediat & Emergency Med, Aurora, CO USA
[4] Donald & Barbara Zucker Sch Med Hofstra Northwell, Dept Pediat, Hempstead, NY USA
[5] Donald & Barbara Zucker Sch Med Hofstra Northwell, Dept Emergency Med, Hempstead, NY USA
[6] Harvard Med Sch, Dept Emergency Med, Boston, MA USA
[7] Harvard Med Sch, Dept Pediat, Boston, MA USA
[8] George Washington Univ, Sch Med & Hlth Sci, Dept Emergency Med, Washington, DC 20052 USA
[9] Univ Michigan, Sch Med, Dept Emergency Med, Ann Arbor, MI USA
[10] Univ Michigan, Sch Med, Dept Pediat, Ann Arbor, MI USA
[11] Brown Univ, Alpert Med Sch, Dept Emergency Med, Providence, RI 02912 USA
[12] Brown Univ, Dept Pediat, Alpert Med Sch, Providence, RI 02912 USA
[13] Ohio State Univ, Dept Pediat, Coll Med, Columbus, OH 43210 USA
[14] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[15] Oregon Hlth & Sci Univ, Dept Pediat, 3181 Sw Sam Jackson Pk Rd, Portland, OR 97201 USA
[16] Univ Arizona, Coll Med, Dept Emergency Med, Tucson, AZ USA