Funding for this research was provided by:
Wellcome Trust (109313/Z/15/Z, 084401/Z/07/B)
UK Medical Research Council and Department for International Development (MR/R015600/1)
Received: 17 July 2019
Accepted: 30 April 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: All procedures of this study were in accordance with the ethical approval granted by the Imperial College London Research Ethics Committee (ICREC_9_3_13) and the Medical Research Council of Zimbabwe (MRCZ/A/681). Informed consent was obtained in writing from all individual participants included in the study.
: Not applicable.
: S.G. declares shareholding in pharmaceutical companies (GSK and Astra Zeneca). R.T. declares personal fees received for consultancy for the International Decision Support Initiative. The authors declare no further potential competing interests.