Received: 18 August 2021
Accepted: 14 March 2022
First Online: 30 March 2022
: The study protocol was approved by the ethics committee of the School of Public Health of the University of Kinshasa (ESP/CE/ 053/2016) and the study was conducted in accordance with the Helsinki principles. All participants signed written informed consent forms before enrollment.
: Not applicable.
: The authors declare no conflict of interest.