1. Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA
2. Institute for Health Research, Kaiser Permanente Colorado, Aurora, CO, USA
3. Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, USA
4. The Emmes Company, Rockville, MD, USA
5. National Institutes of Health, National Institutes on Drug Abuse, Rockville, MD, USA
6. Kaiser Permanente Northern California Division of Research, Oakland, CA, USA