Funding for this research was provided by:
Agencia Española de Cooperación Internacional para el Desarrollo (AECID2017/CTR/0900237)
Received: 20 June 2020
Accepted: 27 November 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: This study was approved by the Ministry of Health and Social Welfare of Equatorial Guinea and the Ethics Committee of the Spanish Carlos III National Health Institute (CEI PI 71_2017). Written informed consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.