Received: 30 September 2020
Accepted: 9 February 2021
First Online: 11 March 2021
: The protocol and the informed consent form were approved by the Ethics Committee of the Faculty of Medicine, University of Kinshasa (Approval No.: ESP/CE/111/2018). All participants involved in the study signed an informed consent form. For participants aged < 18 years old, the consent form was approved and signed by their parent or guardian.
: Not applicable.
: The authors declare that they have no competing interests.