1. Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
2. Center for Community-Based Research, Dana-Farber Cancer Institute, Boston, Massachusetts
3. Boston Health Care for the Homeless Program, Boston, Massachusetts
4. Division of General Internal Medicine, Massachusetts General Hospital, Boston
5. Centre for Urban Health Solutions, St Michael’s Hospital, Toronto, Ontario, Canada
6. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts