Travis P. Baggett and James J. O’Connell are with the Division of General Internal Medicine, Massachusetts General Hospital, Boston, MA, the Department of Medicine, Harvard Medical School, Boston, MA, and the Boston Health Care for the Homeless Program, Boston, MA. Bianca C. Porneala is with the Division of General Internal Medicine, Massachusetts General Hospital, Boston. Yuchiao Chang, Daniel E. Singer, and Nancy A. Rigotti are with the Division of General Internal Medicine, Massachusetts General...