Published on in Vol 9, No 1 (2021): January
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/21244, first published
.
1 MRC International Statistics and Epidemiology Group, London School of Hygiene & Tropical Medicine, London, United Kingdom
2 Biomedial Resarch and Training Institute, Harare, Zimbabwe
3 Department of Clinical Research, London School of Hygiene & Tropical Medicine, London, United Kingdom