1. Department of Pediatrics Dartmouth-Hitchcock Medical Center, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA
2. Department of Primary Care Medicine Massachusetts General Hospital, Harvard Medical School, Boston Health Care for the Homeless Program, Boston, Massachusetts, USA
3. Department of General Internal Medicine Boston Medical Center, Boston University School of Medicine, Boston Health Care for the Homeless Program, Boston, Massachusetts, USA
4. Department of General Internal Medicine Boston Medical Center, Boston Health Care for the Homeless Program, Boston, Massachusetts, USA
5. Boston Health Care for the Homeless Program, Boston, Massachusetts, USA
6. Department of Primary Care Medicine Massachusetts General Hospital, Harvard Medical School, Boston Healthcare for the Homeless Program, Boston, Massachusetts, USA