Funding for this research was provided by:
National Science Foundation of Sri Lanka (RPHS/ 2016/D/05)
Text and Data Mining valid from 2021-01-07
Version of Record valid from 2021-01-07
Article History
Received: 10 February 2020
Accepted: 10 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.