1 The Permanente Medical Group and the Kaiser Permanente Division of Research, Oakland, CA; The Department of Emergency Medicine, Kaiser Permanente Roseville Medical Center, Roseville, CA.
2 Department of Emergency Medicine, University of California, Davis, Sacramento, CA.
3 The Permanente Medical Group and the Kaiser Permanente Division of Research, Oakland, CA; The Department of Emergency Medicine, Kaiser Permanente Vallejo Medical Center, Vallejo, CA.
4 Department of Emergency Medicine, Vanderbilt University Medical Center, Nashville, TN.
5 Departments of Emergency Medicine and Healthcare Delivery and Population Science, UMass Chan Medical School-Baystate, Springfield, MA.