Text and Data Mining valid from 2020-03-20
Received: 28 November 2019
Accepted: 13 March 2020
First Online: 20 March 2020
Ethics approval and consent to participate
: The protocol and the informed consent form were approved by the Ethics Committee of the Faculty of Medicine, University of Kinshasa (Approval No: ESP MINESU 019/2016). All participants involved in the study signed an informed consent form. In cases where participants were young (children), the consent form was approved and signed by their parents or guardians.
: Not applicable.
: The authors declare that they have no competing interests.