Acknowledgements
We acknowledge infrastructural support from the Liverpool Biomedical Research Centre funded by Liverpool Health Partners and appreciate the support of the staff. We would also like to thank the participating patients, staff and management of Federal Medical Centre, Makurdi, Nigeria for their ongoing support of the VADICT study. Fogarty International Center of the National Institutes of Health provided research training support for Jacinta Nwogu under award number D43TW009608.