[1] Oregon Hlth & Sci Univ, Ctr Policy & Res Emergency Med, Dept Emergency Med, 181 SW Sam Jackson Park Rd,Mail Code CR-11, Portland, OR 97239 USA
[2] Oregon Hlth & Sci Univ, Knight Canc Inst Biostat Shared Resource, Portland, OR USA
[3] Harbor UCLA Med Ctr, Los Angeles Cty Emergency Med Serv, Torrance, CA USA
[4] Univ Calif Sacramento, Davis Sch Med, Dept Emergency Med, Sacramento, CA USA
[5] Univ Calif Davis, Sch Med, Dept Pediat, Sacramento, CA USA
[6] Stanford Univ, Ctr Hlth Policy Primary Care & Outcomes Res, Dept Med, Sch Med, Palo Alto, CA USA
[7] Childrens Natl Hosp, Ctr Surg Care, Div Trauma & Burn Surg, Washington, DC USA
[8] Indiana Univ Sch Med, Dept Surg, Indianapolis, IN USA
[9] Univ Calif San Francisco, Dept Surg, San Francisco, CA USA
[10] Rutgers New Jersey Med Sch, Dept Surg, Newark, NJ USA
[11] Univ Utah, Sch Med, Dept Pediat, Salt Lake City, UT USA
[12] Univ Louisville, Norton Childrens Hosp, Sch Med, Dept Surg, Louisville, KY USA
[13] Univ Calif San Francisco, Benioff Childrens Hosp, Dept Surg, San Francisco, CA USA
[14] Oregon Hlth Author, Oregon Emergency Med Serv Children Program, Portland, OR USA
[15] Icahn Sch Med Mt Sinai, Dept Emergency Med, New York, NY USA
[16] Univ Texas Austin, Dell Med Sch, Dept Pediat, Austin, TX USA
[17] Univ Texas Austin, Med Sch, Dept Surg, Austin, TX USA