1. Institute for Research, Quality, and Policy in Homeless Health Care, Boston Health Care for the Homeless Program, Boston, Massachusetts, USA
2. Division of Global Health Equity, Department of Internal Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, USA
3. Harvard Medical School, Boston, Massachusetts, USA
4. Harvard College, Cambridge, Massachusetts, USA
5. Division of General Internal Medicine, Department of General Internal Medicine, Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts, USA
6. Division of General Internal Medicine, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA