Funding for this research was provided by:
Received: 5 February 2021
Accepted: 27 October 2021
First Online: 22 November 2021
: There were no active participants in the study and data abstracted from register were anonymized. The study was approved by the National BioEthics Committee of Chad (N°0173/PR/MESRI/SG/CNBT/2020) and the Liverpool School of Tropical Medicine Research Ethics Committee (19-071) which waived the requirement for informed consent. All methods in this study were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors have no competing interests to declare.