[1] Hamilton Hlth Sci, Hamilton, ON, Canada
[2] McMaster Univ, Hamilton, ON, Canada
[3] Northwestern Univ, Inst Hlth Serv Res & Policy Studies, Chicago, IL 60208 USA
[4] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[5] Brigham & Womens Hosp, Emergency Dept, Boston, MA 02115 USA
[6] Sutter Emergency Med Assoc Inc, Davis, CA USA
[7] Triage First Inc, Asheville, NC USA
[8] Lehigh Valley Hosp & Hlth Network, Penn State Coll Med, Allentown, PA USA
[9] Eidos Healthcare Resources, Green Pond, NJ USA
[10] Univ Texas, Hlth Sci Ctr, SW Med Sch, Dallas, TX 75235 USA
[11] Macneal Mem Hosp, Dept Emergency Med, Berwyn, IL USA
[12] Dept Emergency Med, Chapel Hill, NC USA