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.).