1. Department of Emergency Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA.
2. Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA.
3. Division of Pulmonary, Critical Care and Sleep Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA.
4. Department of Population and Public Health Sciences, Keck School of Medicine, University of Southern California. Los Angeles, CA.