Funding for this research was provided by:
Wellcome Trust (208523/Z/17/Z)
Received: 22 June 2021
Accepted: 13 April 2022
First Online: 7 May 2022
: This study was approved by the WHO European Regional Office Ethical Review Committee. The authors alone are responsible for the views expressed in this chapter and they do not necessarily represent the views, decisions or policies of the institutions with which they are affiliated.
: We declare no competing interests.