Received: 26 February 2021
Accepted: 27 May 2021
First Online: 17 July 2021
: Informed consent was obtained from all study participants. Ethical approval was granted by LSHTM (reference 16,451) and University of Zambia Biomedical Research Ethics Committee (reference: 011–08-17). Livingstone Central Hospital Superintendent gave permission to conduct the study.
: Informed consent was obtained from all study participants for publication and dissemination of results. All authors gave consent for publication.
: No author declares any competing interest.