Received: 15 February 2019
Accepted: 19 June 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Committee of Kathmandu University School of Medical Sciences, Dhulikhel, Nepal (ethical approval number 52/17). Informed consent to participate in the study was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.