[1] Brown Univ, Dept Emergency Med, Alpert Med Sch, Providence, RI 02912 USA
[2] Brown Univ, Dept Hlth Serv Policy & Practice, Sch Publ Hlth, Providence, RI 02912 USA
[3] Boston Univ, Ctr Anxiety & Related Disorders, Dept Psychol & Brain Sci, Boston, MA 02215 USA
[4] Univ N Carolina, Dept Anesthesiol, Chapel Hill, NC 27515 USA
[5] TRYUMPH Res Program, Raleigh, NC USA
[6] Duke Univ, Ctr Translat Pain Med, Dept Anesthesiol, Durham, NC USA
[7] Univ N Carolina, Dept Emergency Med, Chapel Hill, NC 27515 USA