1. Department of Epidemiology, Biostatistics & Informatics University of Pennsylvania Philadelphia Pennsylvania USA
2. Department of Psychiatry University of Pennsylvania Philadelphia Pennsylvania USA
3. Department of Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
4. Department of Medicine Georgetown University Washington DC USA
5. Department of Epidemiology and Biostatistics University of California San Francisco San Francisco California USA
6. Department of Medicine University of Washington Seattle Washington USA
7. Department of Medicine Case Western Reserve University Cleveland Ohio USA
8. Department of Medicine University of California San Diego San Diego California USA
9. Department of Psychiatry University of Toronto Toronto Ontario Canada
10. Department of Pharmacology & Toxicology University of Toronto Toronto Ontario Canada
11. The Centre for Addiction and Mental Health Toronto Ontario Canada
12. Department of Psychology State University of New York at Buffalo Buffalo New York USA