Funding for this research was provided by:
Government of the United Kingdom (168D)
Article History
Received: 1 November 2019
Accepted: 5 February 2020
First Online: 2 March 2020
Ethics approval and consent to participate
: Ethics approval for the study was obtained from the Ethics Committee of Northwest and Central Switzerland and the Kenya Medical Research Institute approval number 2018–00694. All study participants were over the age of 18 years or older and provided written informed consent.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.