Funding for this research was provided by:
médecins sans frontières
Received: 14 July 2021
Accepted: 16 March 2022
First Online: 29 March 2022
: No individual patient data were used in this study. All study procedures were approved by the Research Ethics Committee of the London School of Hygiene and Tropical Medicine (No. 17994) and received an ethics exemption from the International Ethics Board of Médecins Sans Frontières.
: Not applicable.
: On behalf of all authors, there are no competing interests to declare that could be construed to have influenced the work. The authors alone are responsible for their views expressed in this article and they do not represent the views, decisions or policies of the institutions with which they are associated. Authors from MSF (RD, EM, MM, RVDB), UNICEF (PM) and respective Ministries of Health (PW) contributed independently in their own rights as individuals.