1. Department of Psychiatry and Behavioral Sciences, University of California, Davis, Sacramento, California, USA.
2. Northern California Veterans Administration, Sacramento, California, USA.
3. School of Medicine, Stanford University, Palo Alto, California, USA.
4. Addiction Treatment Services, Veterans Affairs Palo Alto Healthcare System, Palo Alto, California, USA.
5. University of Colorado Anschutz Medical Campus, Denver, Colorado, USA.
6. Department of Psychiatry, University of California, Irvine, California, USA.
7. Department of Public Health Sciences, University of California, Davis, Sacramento, California, USA.
8. Division of Clinical Affairs, University of California, Davis, Sacramento, California, USA.