About the Authors
- Timothy B Hallett, Simon Gregson, Sabada Dube, Geoff P Garnett
- Department of Infectious Disease Epidemiology, Imperial College London, United Kingdom
- Simon Gregson
- Biomedical Research and Training Institute, Harare, Zimbabwe
SG owns shares in GlaxoSmithKline and Astra Zeneca. The other authors declare that they have are no competing interests.
All authors helped design the study, analyse the results, and write the paper.