1 Department of Emergency Medicine, Regions Hospital, St. Paul, MN, and HealthPartners, University of Minnesota. Electronic address: michael.t.paddock@healthpartners.com.
2 McGill University Department of Family Medicine and Chisasibi Hospital, Chisasibi, QC.
3 Division of Emergency Medicine Greater Los Angeles VA Healthcare System and the David Geffen School of Medicine at UCLA, Los Angeles, CA.
4 Department of Emergency Medicine, University of California, San Francisco-Fresno, Fresno, CA.