Received: 7 May 2021
Accepted: 11 July 2021
First Online: 20 July 2021
: The study was reviewed and approved by the Equatorial Guinea National Ethics Committee (Comité Ethico National de Guinée Equatoriale), the Ifakara Health Institute Institutional Review Board (IHI IRB), and the Ethics Committee of Northwestern and Central Switzerland (EKNZ).
: Not applicable.
: The authors declare that they have no competing interests.