Funding for this research was provided by:
Wellcome Trust (097268/Z/11/Z)
Received: 3 December 2020
Accepted: 3 June 2021
First Online: 10 June 2021
: The study from which these data were drawn was approved by the UCL Research Ethics Committee and the College of Medicine Research Ethics Committee at the University of Malawi, reference numbers 3974/001 and P.03/12/1273 respectively. All participants gave written informed consent to take part in this research.
: Not applicable.
: The authors declare that they have no competing interests.