Received: 12 December 2020
Accepted: 23 April 2021
First Online: 2 May 2021
: All the respondents provided signed informed consent for participation in the study, either by written signature or by fingerprints, depending on literacy. All procedures performed in this study were approved by the Institutional Ethics Committee of the Université Catholique de Bukavu and were in accordance with the 1964 Helsinki declaration and its later amendments.
: The authors declare that they have no competing interests.