[1] Hennepin Cty Med Ctr, Dept Emergency Med, Minneapolis, MN 55415 USA
[2] Hennepin Cty Med Ctr, Div Pulm Allergy & Crit Care Med, Minneapolis, MN USA
[3] Denver Hlth, Dept Emergency Med, Denver, CO USA
[4] Univ Alabama Birmingham, Dept Med, Div Pulm Allergy & Crit Care Med, Birmingham, AL USA
[5] Birmingham Vet Affairs Med Ctr, Pulm Sect, Birmingham, AL USA
[6] Univ Washington, Dept Anesthesiol & Crit Care Med, Harborview Med Ctr, Seattle, WA USA
[7] Univ Mississippi Med Ctr, Dept Med, Div Pulm Crit Care & Sleep Med, Jackson, MS USA
[8] Univ Iowa Hosp & Clin, Dept Internal Med, Div Pulm Crit Care & Occupat Med, Iowa City, IA USA
[9] Atrium Hlth Wake Forest Baptist, Dept Anesthesiol, Sect Crit Care, Winston Salem, NC USA
[10] Atrium Hlth Wake Forest Baptist, Dept Emergency Med, Winston Salem, NC USA
[11] Univ Colorado, Sch Med, Dept Emergency Med, Aurora, CO USA
[12] Baylor Scott & White Hlth, Dept Med, Div Pulm Dis Crit Care & Sleep Med, Temple, TX USA
[13] Wake Forest Sch Med, Sect Pulm Crit Care Allergy & Immunol, Winston Salem, NC USA
[14] Vanderbilt Univ, Dept Anesthesiol, Div Anesthesia Crit Care Med, Med Ctr, Nashville, TN USA
[15] Louisiana State Univ, Univ Med Ctr New Orleans, Sch Med, New Orleans, LA USA
[16] Louisiana State Univ, Dept Med, Sect Pulm Crit Care Med & Allergy Immunol, Sch Med, New Orleans, LA USA
[17] Oregon Hlth & Sci Univ, Dept Med, Div Pulm & Crit Care Med, Sch Med, Portland, OR USA
[18] Univ Washington, Dept Emergency Med, Harborview Med Ctr, Seattle, WA USA
[19] Vanderbilt Univ, Dept Med, Div Pulm Allergy & Crit Care Med, Med Ctr, Nashville, TN USA
[20] Vanderbilt Univ, Dept Emergency Med, Med Ctr, Nashville, TN USA
[21] Atrium Carolinas Med Ctr, Pulm & Crit Care Associates, Charlotte, NC USA
[22] Lahey Hosp & Med Ctr, Dept Med, Div Pulm & Crit Care Med, Burlington, MA USA
[23] Ochsner Hlth, Dept Pulm & Crit Care Med, New Orleans, LA USA
[24] Lincoln Med Ctr, Dept Emergency Med, New York, NY USA
[25] Univ Alabama Birmingham, Dept Emergency Med, Birmingham, AL USA