1. Department of Health Care Policy, Harvard Medical School and Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts (Z.S.)
2. Department of Health Care Policy, Harvard Medical School, Department of Biostatistics and CAUSALab, Harvard T.H. Chan School of Public Health, and Department of Statistics, Faculty of Arts and Sciences, Harvard University, Boston, Massachusetts (J.R.Z.)
3. Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts (M.G.)
4. University of Michigan, Ann Arbor, Michigan (E.P.)
5. Department of Psychiatry, Massachusetts General Hospital and Boston Health Care for the Homeless Program, Boston, Massachusetts (K.A.K.).