1 The Institute for Research, Quality, and Policy in Homeless Health Care at The Boston Health Care for the Homeless Program, Boston, Massachusetts, United States. Electronic address: jbrody@bhchp.org.
2 Section of General Internal Medicine, Boston University School of Medicine, Boston, Massachusetts, United States.
3 Center for Health Promotion and Health Equity Brown University School of Public Health Providence, Rhode Island, Unites States; The Fenway Institute, Boston, Massachusetts, Unites States.
4 Herbert Wertheim School of Public Health and Human Longevity Science University of California, San Diego, United States.