Received: 30 October 2018
Accepted: 14 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: Ethical approval was obtained from Mekelle University, College of Health Sciences, Institutional Review Board (IRB). An informed consent was obtained from the commandant of the schools, participants, participant’s parent/guardian before being enrolled in the study. In addition, participants were assured about the aim, possible risk if any, and confidentiality of the study using their own local language (Afaraff language).
: This manuscript has not been published elsewhere by another journal.
: The authors declared no competing interests.