1. Division of Infectious Disease, Department of Medicine, University of British Columbia and Vancouver Hospital and Health Sciences Centre, Vancouver, British Columbia, Canada
2. Division of Infectious Diseases, Department of Medicine, Queen’s University, Kingston, Canada
3. Department of Surgery, University of Toronto, Toronto, Ontario, Canada
4. Department of Surgery, University of Calgary, Calgary, Alberta, Canada
5. Departments of Pathology and Laboratory Medicine, University of Minnesota and Hennepin County Medical Center, Minnesota, USA
6. Department of Medical Microbiology and Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
7. Department of Infectious Diseases and Microbiology, Hôspital Maisonneuve-Rosemont, University of Montreal, Montreal, Quebec, Canada