1. Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, Colorado.
2. Boulder County Public Health, Colorado School of Public Health, Aurora, Colorado.
3. Johnson Depression Center, Department of Psychiatry and Emergency Medicine, University of Colorado School of Medicine, Aurora, Colorado.
4. Health Sciences Library, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
5. Altitude Research Center, Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, Colorado.