[1] Univ Calif San Francisco, Dept Emergency Med, San Francisco, CA 94143 USA
[2] San Francisco Gen Hosp, San Francisco, CA 94110 USA
[3] Univ Penn, Dept Emergency Med, Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Indiana Univ Sch Med, Dept Emergency Med, Indianapolis, IN 46202 USA
[5] Mayo Clin, Dept Emergency Med, Rochester, MN 55905 USA
[6] Brown Univ, Dept Emergency Med, Warren Alpert Med Sch, Providence, RI 02912 USA
[7] Thomas Jefferson Univ, Sidney Kimmel Med Coll, Dept Emergency Med, Philadelphia, PA 19107 USA
[8] NYU, Dept Emergency Med, New York, NY USA
[9] Robert Wood Johnson Clin Scholars Program, Los Angeles, CA USA
[10] US Dept Vet Affairs, Los Angeles, CA USA
[11] RAND Hlth, Santa Monica, CA USA
[12] Royal Coll Surgeons Ireland, Emergency Care Res Unit, Div Populat Hlth Sci, Dublin 2, Ireland
[13] Univ Penn, Perelman Sch Med, Ctr Emergency Care Policy & Res, Philadelphia, PA 19104 USA
[14] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA
[15] Mayo Clin, Dept Hlth Sci Res, Knowledge & Evaluat Res Unit, Div Hlth Care Policy & Res, Rochester, MN USA
[16] Mayo Clin, Robert D & Patricia E Kern Ctr Sci Hlth Care Deli, Rochester, MN USA
[17] Brown Univ, Warren Alpert Med Sch, Dept Diagnost Imaging, Providence, RI 02912 USA
[18] Emory Univ, Sch Med, Dept Radiol & Imaging Sci, Atlanta, GA USA
[19] Natl Acad Ctr Telehlth, Philadelphia, PA USA
[20] NYU, Dept Populat Hlth, New York, NY USA
[21] Washington Univ, Sch Med, Div Emergency Med, St Louis, MO USA
[22] Washington Univ, Emergency Care Res Core, St Louis, MO USA
[23] Mayo Clin, Dept Hlth Sci Res, Div Healthcare Policy Res, Knowledge & Evaluat Res Unit, Rochester, MN USA