Received: 15 January 2019
Accepted: 13 May 2019
First Online: 21 May 2019
Ethics approval and consent to participate
: This research work was given an ethical approval by Ethical Review Committee of Nepal Health Research Council (NHRC), Nepal. Written informed consent was obtained from all the participants. In the case of minors, consent was given by parents or guardians.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.