1 British Columbia Centre for Disease Control, Vancouver, BC, Canada.
2 British Columbia Centre for Disease Control, Vancouver, BC, Canada; Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada.
3 British Columbia Centre for Disease Control, Vancouver, BC, Canada; Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada.
4 British Columbia Centre for Disease Control, Vancouver, BC, Canada; School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada. Electronic address: naveed.janjua@bccdc.ca.