[1] CEP Amer Presence Mercy Med Ctr, Dept Emergency Med, Aurora, IL USA
[2] Wake Forest Baptist Med Ctr, Dept Emergency Med, Winston Salem, NC USA
[3] US Dept HHS, Off Assistant Secretary Preparedness & Response, Emergency Care Coordinat Ctr, Washington, DC 20201 USA
[4] US Dept HHS, Off Assistant Secretary Preparedness & Response, Washington, DC 20201 USA