1. British Columbia Centre for Disease Control, Vancouver, Canada
2. University of British Columbia, Vancouver, Canada
3. University of Calgary, Calgary, Canada
4. Public Health Ontario, Toronto, Canada
5. University of Toronto, Toronto, Canada
6. Provincial Laboratory for Public Health, Edmonton, Canada
7. University of Alberta, Edmonton, Canada
8. Institut National de Santé Publique du Québec, Quebec City, Canada
9. Laval University, Quebec City, Canada
10. Centre Hospitalier Universitaire de Québec, Quebec City, Canada