1. Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, USA
2. Department of Psychiatry, University of Michigan, Ann Arbor, USA
3. VA Center for Clinical Management Research, VA Ann Arbor Healthcare System, Ann Arbor, USA
4. VA Greater Los Angeles Healthcare System, Los Angeles, USA
5. Department of Population Health Sciences, Weill Cornell Medical College, New York, USA
6. Center for Addiction and Mental Health Research, Division of Research, Kaiser Permanente Northern California, Oakland, USA
7. Department of Psychiatry and Behavioral Sciences, Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, USA
8. Center for Clinical Trials Network, National Institute on Drug Abuse, Bethesda, USA