1 Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO.
2 University of Colorado School of Medicine, Aurora, CO.
3 Department of Emergency Medicine, University of Colorado School of Medicine, Denver, CO; Department of Emergency Medicine, Denver Health Medical Center, Denver, CO.
4 Department of Family Medicine, University of Colorado School of Medicine, Aurora, CO.
5 Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, CO.