Received: 30 October 2018
Accepted: 21 March 2019
First Online: 18 April 2019
Ethics approval and consent to participate
: This study was ethically approved by Ethical Review Committee of University of Gondar, College of Medicine and Health Sciences, school of Biomedical and Laboratory sciences. Permission was obtained from each health institution. Written assent was taken from each child’s parent/guardian after they understood the purpose of the study. All the subjects’ data were kept in full confidentiality and was not be disclosed to an unauthorized person.
: Not applicable.
: The authors declare that they have no competing interests.
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