[1] Univ Washington, Div Pulm Crit Care Med & Sleep Med, Seattle, WA USA
[2] Univ Washington, Sch Med, Seattle, WA USA
[3] Univ Washington, Div Anesthesiol & Pain Med, Seattle, WA USA
[4] Univ Washington, Harborview Injury Prevent & Res Ctr, Seattle, WA USA
[5] Univ Washington, Div Trauma Burn & Crit Care Surg, Seattle, WA USA
[6] Univ Washington, Cambia Palliat Care Ctr Excellence, Seattle, WA USA
[7] Univ Washington, Div Geriatr Med, Seattle, WA USA
[8] Univ Washington, Div Pulm & Crit Care Med, 1959 NE Pacific St,Campus Box 356522, Seattle, WA 98195 USA