Received: 26 February 2021
Accepted: 11 July 2021
First Online: 21 July 2021
: Participation of human research subjects conformed to institutional review board guidelines, applicable laws, and the World Medical Association Declaration of Helsinki. The study was approved by the ethics committee of the School of Public Health at the University of Kinshasa (Approval No. ESP/CE/29/2020).
: Not applicable.
: The authors declare that they have no competing interests.