Received: 30 October 2019
Accepted: 23 June 2020
First Online: 10 July 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Review Board of Jimma University. Written informed consent from adult participants and parents/guardians of the study children and assent from children aged less than 18 years was obtained for all participants. If a patient, parent or guardian was illiterate, impartial witness was used.
: All authors have given their consent for publication.
: The authors declare that they have no competing interests.