1. Department of Medical Microbiology, McGill University Health Centre, Montreal, Quebec, Canada
2. L'Hôpital Regional George Dumont, Moncton, New Brunswick, Canada
3. Laboratoire de Santé Publique du Quebec, Ste-Anne-de-Bellevue, Quebec, Canada
4. Special Bacteriology Section, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada