Received: 29 October 2019
Accepted: 11 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: Ethical clearance was issued by the Institutional Ethics Committee for Research on Human Health of the University of Douala (IEC-UD), Cameroon. Reference number: IEC-UD/452/02/2016/T on the 25th of February 2016 in Douala, Cameroon. The need for consent from patients was waived by the aforementioned IRB.
: Not applicable in this section.
: The authors declare that they have no competing interests.