Received: 12 August 2019
Accepted: 28 September 2019
First Online: 4 October 2019
Ethics approval and consent to participate
: Research approval was taken from AASRA Research and Education Academy Counsel, Biratnagar and Microbiology Department of MMAMC, Biratnagar, Nepal.
: Not applicable.
: The authors declare that they have no competing interests.