Received: 10 December 2020
Accepted: 5 May 2021
First Online: 19 May 2021
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving research study participants were approved by the Ethical Committee of the Université Catholique de Bukavu (UCB/CIES/NC/08/2018). Informed consent was obtained from all study participants as well as from infants’ parents.
: Not applicable.
: The authors declare that they have no competing interests.