1. British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada
2. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
3. Department of Experimental Medicine, University of British Columbia, Vancouver, British Columbia, Canada
4. Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada
5. Department of Pathology and Laboratory Medicine, British Columbia Children’s and Women’s Hospital, Vancouver, British Columbia, Canada
6. Vaccine Evaluation Center, British Columbia Children’s Hospital Research Institute, Vancouver, British Columbia, Canada
7. Department of Pediatrics, British Columbia Children’s Hospital, Vancouver, British Columbia, Canada
8. Women's Health Research Institute, Vancouver, British Columbia, Canada