Received: 10 September 2019
Accepted: 12 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: This study received approval from the “<i>Commission des Lois et Textes</i>” of the Ministry of Health of Gabon during the second Steering Committee of the Project.All study participants signed an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.