1. Department of Psychology San Diego State University San Diego USA
2. Division of Infectious Diseases and Global Public Health, Department of Medicine University of California San Diego La Jolla USA
3. Department of Family Medicine and Public Health University of California San Diego La Jolla USA
4. School of Public Health University of Nevada Reno USA
5. British Columbia Centre on Substance Use Vancouver Canada
6. Centre on Drug Policy Evaluation St. Michael's Hospital Toronto Canada