1. Clinical Addiction Research and Education Unit at Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts (M.R.L.)
2. Tufts University School of Medicine, Boston, Massachusetts (T.J.S.)
3. Boston University School of Public Health, Boston, Massachusetts (Z.X.)
4. Center for Research on Health Care, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (J.M.L.)
5. Clinical Addiction Research and Education Unit at Boston University School of Medicine and Boston Medical Center and Bureau of Substance Addiction Services, Massachusetts Department of Public Health, Boston, Massachusetts (A.Y.W.)