Received: 9 August 2019
Accepted: 3 February 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Kathmandu University School of Medical Sciences, Institutional Review Committee (KUSMS-IRC). Informed consent to participate in the study was obtained from the children’s parent or guardian.
: Not applicable
: The authors declare that they have no competing interests.