1 Department of Obstetrics & Gynecology, University of British Columbia, Vancouver, BC; CIHR Canadian HIV Trials Network, Vancouver, BC.
2 Department of Obstetrics & Gynecology, University of British Columbia, Vancouver, BC.
3 Public Health Laboratory, BC Centre for Disease Control, Vancouver, BC; Department of Pathology & Laboratory Medicine, University of British Columbia, Vancouver, BC.
4 Department of Experimental Medicine, University of British Columbia, Vancouver, BC.
5 School of Population & Public Health, University of British Columbia, Vancouver, BC.
6 Department of Obstetrics & Gynecology, University of British Columbia, Vancouver, BC. Electronic address: deborah.money@ubc.ca.