Funding for this research was provided by:
Wellcome Trust (WT102350/Z/13/Z)
Howard Hughes Medical Institute (OPP1099295)
Received: 19 June 2019
Accepted: 11 September 2019
First Online: 18 September 2019
: This study was approved by the Ifakara Health Institute Review board (Ref. IHI/IRB/EXT/No: 005-2018), and the Medical Research Coordinating Council at the Tanzanian National Institute of Medical Research (NIMR) (Ref. NIMR/HQ/R.8c/Vol.II/880). Written and oral informed consent was obtained from all volunteers participating in this study, after being provided with all necessary information regarding goals, objective, benefits and risks associated with the study.
: Permission to publish the work was also obtained from NIMR (NIMR/HQ/P.12 VOL XXVIII/10).
: The authors declare that they have no competing interests.