1. Clinical Addiction Research and Education Unit, Section of General Internal Medicine, Department of Medicine, Boston Medical Center, Boston, Massachusetts2Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
2. Clinical Addiction Research and Education Unit, Section of General Internal Medicine, Department of Medicine, Boston Medical Center, Boston, Massachusetts
3. Department of General Internal Medicine, Butler Hospital, Providence, Rhode Island4Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, Rhode Island
4. Department of Psychology, The University of Memphis, Memphis, Tennessee