Received: 24 February 2020
Accepted: 7 August 2020
First Online: 17 August 2020
Ethics approval and consent to participate
: The Cameroon National Ethics Committee approved the protocol prior to implementation with the number 2016/08/754/L/CNERH/SP.
: All authors have read the manuscript and have agreed for publication.
: The authors declare that they have no competing interests.