[1] Brown Univ, Dept Emergency Med, Providence, RI 02912 USA
[2] Univ British Columbia, Vancouver, BC, Canada
[3] Univ Virginia, Charlottesville, VA USA
[4] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[5] NYU, Sch Med, Dept Emergency Med, New York, NY USA
[6] Yale Univ, Dept Emergency Med, New Haven, CT USA
[7] Univ North Carolina Chapel Hill, Dept Emergency Med, Chapel Hill, NC USA
[8] Mayo Clin, Dept Emergency Med, Rochester, MN USA
[9] Emory Univ, Dept Emergency Med, Atlanta, GA 30322 USA
[10] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[11] Oregon Hlth & Sci Univ, Dept Hematol Oncol, Portland, OR 97201 USA
[12] McGill Univ, Sch Social Work, Montreal, PQ, Canada
[13] Natl POLST Paradigm, Portland, OR USA
[14] Harvard Med Sch, Sect Gen Med, Boston, MA USA
[15] Univ N Carolina, Dept Emergency Med, Chapel Hill, NC 27514 USA
[16] Univ N Carolina, Dept Anesthesiol, Chapel Hill, NC 27514 USA