Funding for this research was provided by:
Ludwig-Maximilians-Universität München
Article History
Accepted: 24 November 2021
First Online: 16 December 2021
Declarations
:
: As all included data were publicly available, the ethics boards of the London School of Hygiene and Tropical Medicine (MSc Ethics reference 16696) determined that no ethical approval was required.
: The authors declare no competing interests.