1. Dalhousie Medicine New Brunswick, Dalhousie University, New Brunswick, Canada
2. Division of Infectious Diseases, Department of Medicine, Saint John Regional Hospital, Saint John, New Brunswick, Canada
3. The Provincial Laboratory for Public Health (Microbiology) and the Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada
4. Division of Infectious Diseases, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada