1 Departments of Emergency Medicine, Anesthesia Critical Care, and Epidemiology, University of Iowa Carver College of Medicine, Iowa City, IA, United States of America. Electronic address: nicholas-mohr@uiowa.edu.
2 Health, Homelessness, & Criminal Justice Lab, Hennepin Healthcare Research Institute, Hennepin County Health Care for the Homeless, Minneapolis, MN, United States of America.
3 National Health Care for the Homeless Council, Nashville, TN, United States of America.
4 University of California-Los Angeles Ronald Reagan Medical Center, Los Angeles, CA, United States of America.