1. From the Birmingham Veterans Affairs Medical Center and the University of Alabama at Birmingham School of Medicine, Birmingham (S.G.K.); Massachusetts General Hospital, Harvard Medical School, and the Boston Health Care for the Homeless Program — all in Boston (T.P.B., J.J.O.); Baylor College of Medicine and Healthcare for the Homeless – Houston, Houston (D.S.B.); and the University of California, San Francisco, and Zuckerberg San Francisco General Hospital (M.B.K.) — both in San Francisco.