1 Department of Emergency Medicine, Los Angeles County Harbor-UCLA Medical Center, Torrance, CA; David Geffen School of Medicine at UCLA, Los Angeles, CA.
2 Department of Emergency Medicine, Oregon Health & Science University, Portland, OR.
3 Department of Emergency Medicine, University of California, Davis School of Medicine, Sacramento, CA.
4 University of Iowa Hospitals and Clinics, Iowa City, IA.
5 Department of Emergency Medicine, UCLA Ronald Reagan/Olive View, Los Angeles, CA.
6 David Geffen School of Medicine at UCLA, Los Angeles, CA; Department of Emergency Medicine, UCLA Ronald Reagan/Olive View, Los Angeles, CA.