1. Mental Health Service, Northern California Veterans Administration Health Care System, Mather, CA, USA;
2. Department of Psychiatry & Behavioral Sciences & Health System, University of California Davis School of Medicine, Sacramento, CA, USA;
3. Department of Psychiatry, University of Toronto, Toronto, ON, Canada;
4. Physician, Addiction Treatment Services, Veterans Affairs Palo Alto Health Care System, Affiliate, University of California, San Francisco, CA, USA;
5. Department of Psychiatry, University of California Irvine, Irvine, CA, USA