1. British Columbia Centre on Substance Use Vancouver Canada
2. Department of Medicine University of British Columbia Vancouver Canada
3. Centre on Drug Policy Evaluation Li Ka Shing Knowledge Institute, St. Michael's Hospital Toronto Canada
4. Institute of Health Policy, Management and Evaluation University of Toronto Toronto Canada
5. British Columbia Provincial Toxicology Centre Vancouver Canada
6. Department of Pathology and Laboratory Medicine University of British Columbia Vancouver Canada
7. Department of Laboratory Medicine and Pathobiology University of Toronto, St Michael's Hospital Toronto Canada
8. Centre for Addiction and Mental Health Clinical Laboratory and Diagnostic Services Toronto Canada
9. Vancouver Coastal Health Authority Vancouver Canada
10. School of Population and Public Health University of British Columbia Vancouver Canada
11. Division of Infectious Diseases and Global Public Health, Department of Medicine University of California San Diego San Diego USA