1. Department of International Health, Johns Hopkins Bloomberg School of Public Health , 615 N. Wolfe Street, Baltimore, MD 21205, USA
2. Centre for Infectious Disease Research in Zambia (CIDRZ) , 34620 Lukasu Road, Mass Media, Lusaka 10101, Zambia
3. Department of Global Health, Stellenbosch University , Stellenbosch, South Africa
4. School of Public Health, University of the Witwatersrand , Johannesburg 2193, South Africa
5. SCMN Global Health Consulting , 261 Middel Street, Pretoria 0181, South Africa