[1] Univ Washington, Harborview Med Ctr, Div Pulm & Crit Care, Sch Med, Seattle, WA 98104 USA
[2] Univ Washington, Sch Med, Div Gen Internal Med, Seattle, WA 98104 USA
[3] Kern Med Ctr, Dept Emergency Med, Bakersfield, CA USA
[4] Case Western Reserve Univ, Div Pulm & Crit Care, Ctr Reducing Hlth Dispar, Cleveland, OH 44106 USA