Funding for this research was provided by:
Wellcome Trust (206724/Z/17/Z)
Wellcome Trust (106680/B/14/Z)
Received: 17 July 2019
Accepted: 13 February 2020
First Online: 22 February 2020
Ethics approval and consent to participate
: The study was approved by Institutional Review Board (IRB) at PNTH (Reference number: 546/NCKH-PNT) and Oxford Tropical Research Ethics Committee (OxTREC Reference number: 24–17), UK.Individual consent to participate was waived by the IRB because this is a retrospective collection and data were recorded and analyzed anonymously.
: Not applicable.
: All authors declare no competing interests.