1. Division of Epidemiology and Biostatistics School of Public Health & Family Medicine University of Cape Town Cape Town South Africa
2. Centre for Infectious Diseases Epidemiology & Research School of Public Health & Family Medicine University of Cape Town Cape Town South Africa
3. ICAP‐Columbia University Mailman School of Public Health New York NY USA
4. Department of Epidemiology Mailman School of Public Health New York NY USA
5. Department of Epidemiology and Biostatistics CUNY Graduate School of Public Health & Health Policy New York NY USA
6. US Centers for Disease Control and Prevention (CDC) Atlanta GA USA
7. College Physicians and Surgeons Columbia University New York NY USA