Division of Infectious Diseases, Department of Medicine, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada. cfjell@interchange.ubc.ca|Division of Infectious Diseases, Department of Medicine, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada. cfjell@interchange.ubc.ca|Division of Infectious Diseases, Department of Medicine, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada. cfjell@interchange.ubc.ca