1. Clinical Addiction Education and Research Unit, Sections of General Internal Medicine and Infectious Diseases, Department of Medicine, Boston University School of Medicine and Grayken Center for Addiction, Boston Medical Center, Boston, Massachusetts, USA
2. Center for Integrated Health Care Research, Kaiser Permanent Hawaii, Honolulu, Hawaii, USA
3. Behavioral Medicine and Addiction Research, Butler Hospital, Providence, RI, USA
4. School of Public Health, Boston University, Boston, Massachusetts, USA