Received: 5 September 2018
Accepted: 27 May 2019
First Online: 10 June 2019
Ethics approval and consent to participate
: Ethical approval was taken from Institutional Review Committee of Chitwan Medical College and reference number of the letter was CMC-IRC/2074/075/187. Written consent was taken from every participant in the study.
: Not applicable.
: The authors declare that they have no competing interests.