[1] Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA 02114 USA
[2] Asahikawa Med Univ, Dept Anesthesiol & Crit Care Med, Asahikawa, Hokkaido, Japan
[3] Capital Allergy & Resp Dis Ctr, Sacramento, CA USA
[4] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[5] Teva Pharmaceut Ind, Frazer, PA USA