1 Division of Infectious Diseases, Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA; Division of Epidemiology and Biostatistics, School of Public Health, University of Cape Town, Cape Town, South Africa. Electronic address: [email protected].
2 Health Economics and Epidemiology Research Office, Wits Health Consortium, University of Witwatersrand, Johannesburg, South Africa; The South African Department of Science and Innovation/National Research Foundation Centre of Excellence in Epidemiological Modelling and Analysis, Stellenbosch University, Stellenbosch, South Africa.