Received: 6 February 2019
Accepted: 7 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: This study was ethically cleared from the Institutional Review Board (IRB) of the College of Medicine and Health Sciences, Hawassa University (Reference number: IRB/160/10). Official permission was obtained from the study site and written informed consent was obtained from all parents/guardians of the children.
: Not applicable.
: The authors declare that they have no competing interests.