[1] Stanford Univ, Dept Emergency Med, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Med, Div Hosp & Palliat Med, Stanford, CA 94305 USA
[3] Stanford Univ, Dept Med, Div Crit Care Med, Stanford, CA 94305 USA
[4] NYU, Sch Med, Ronald O Perelman Dept Emergency Med, New York, NY USA
[5] NYU, Sch Med, Dept Populat Hlth, New York, NY USA
[6] Stanford Univ, Lane Med Lib, Sch Med, Stanford, CA 94305 USA
[7] Stanford Univ, Knowledge Management Ctr, Sch Med, Stanford, CA 94305 USA
[8] Stanford Univ, Dept Med, Div Crit Care, Stanford, CA 94305 USA
[9] Stanford Univ, Dept Anesthesiol, Div Crit Care, Stanford, CA 94305 USA
[10] Stanford Univ, Dept Anesthesiol, Div Hosp & Palliat Med, Stanford, CA 94305 USA