1. School of Population and Public Health, University of British Columbia, Vancouver, BC, Canada
2. Faculty of Health Sciences, Simon Fraser University, Burnaby, BC, Canada
3. Perinatal HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa
4. Center on Gender Equity and Health, University of CA, San Diego, CA, US
5. Newcomb Institute, Tulane University, New Orleans, LA, US
6. Maternal, Adolescent and Child Health Research Unit, University of the Witwatersrand, Durban, South Africa