1. Department of Emergency Medicine, Kaiser Permanente Medical Center, Santa Clara, California.
2. Department of Emergency Medicine, Denver Health Medical Center, Denver, Colorado.
3. Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado.
4. David Geffen School of Medicine at UCLA, Los Angeles, California.
5. Los Angeles Biomedical Research Institute of Harbor-UCLA, Torrance, California.
6. Division of HIV Medicine, Department of Medicine, Harbor-UCLA Medical Center, Torrance, California.
7. AIDS Healthcare Foundation, Los Angeles, California.
8. Department of Emergency Medicine, Harbor-UCLA Medical Center, Torrance, California.