1. British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada;
2. Health Canada Field Epidemiology Training Program, Ottawa, Ontario, Canada;
3. Fraser Health Authority, Abbotsford, British Columbia, Canada;
4. Canadian Food Inspection Agency, Ottawa, Ontario, Canada;
5. National Microbiology Laboratory, Winnipeg, Manitoba, Canada;
6. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
7. Hospital for Sick Children, Toronto, Ontario, Canada;
8. British Columbia Cancer Agency Genome Sciences Centre, Vancouver, British Columbia, Canada