Received: 4 July 2021
Accepted: 22 October 2021
First Online: 3 November 2021
: Ethical clearance was obtained from the institutional ethics committees of the Faculty of Medicine and Biomedical Sciences of the University of Yaoundé 1, and of the Faculty of Medicine and Pharmaceutical Sciences of the University of Douala. All participants gave their consent to participate in this study. Written informed consent was obtained from the parents or guardians of children and participants under 21 years of age.
: Not applicable.
: The authors declare that they have no competing interests.