Funding for this research was provided by:
Bundesbehörden der Schweizerischen Eidgenossenschaft
Received: 29 January 2020
Accepted: 2 July 2020
First Online: 9 July 2020
Ethics approval and consent to participate
: The London School of Hygiene & Tropical Medicine Research Ethics Committee granted ethical approval (reference 16731).All interviewees fully consented to take part in the study.
: Not applicable: no individual data are presented in this paper.
: None of this paper’s authors have any financial or non-financial competing interests in the manuscript.