1. National Center for PTSD, VA Palo Alto Health Care System, CA, USA,
2. Center for Innovation to Implementation, VA Palo Alto Health Care System, CA, USA,
3. Center of Excellence in Substance Abuse Treatment and Education, Philadelphia VAMC, PA, USA,
4. Department of Psychiatry, University of Pennsylvania Perelman School of Medicine, PA, USA,
5. Department of Psychiatry and Behavioral Sciences, Stanford University, CA, USA
6. Centre for Epidemiology and Biostatistics, University of Leeds, UK, and