1. Section of Hospital Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA;
2. Section of Pulmonary and Critical Care Medicine, Department of Medicine, Brown University, Providence, RI;
3. Section of General Internal Medicine, Department of Medicine, Boston Medical Center and Boston University School of Medicine, Boston, MA; and
4. Grayken Center for Addiction, Clinical Addiction Research and Education Unit, Boston, MA.