Received: 11 July 2019
Accepted: 13 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: All study procedures were performed in accordance with the Ethics Committee of University Hospital Joseph Raseta Befelatanana Antananarivo, Madagascar. Study participants and their parents were informed about the study procedures and written informed consent was obtained.
: Not applicable.
: The authors declare that they have no competing interests.