Funding for this research was provided by:
National Institute for Health Research (17/63/42)
Wellcome Trust (109105Z/15/A)
DFID/MRC/Wellcome Joint Global Health Trials (MR/P020577/1)
Received: 7 March 2019
Accepted: 29 May 2019
First Online: 11 June 2019
Ethics approval and consent to participate
: Not required.
: Not applicable.
: The authors declare that they have no competing interests.