Funding for this research was provided by:
National Science Foundation of Sri Lanka (RPHS/2016/D02)
Received: 26 June 2019
Accepted: 17 September 2019
First Online: 23 September 2019
Ethics approval and consent to participate
: Ethical approval for this research work has been obtained (J/ERC/17/80/DR/0040) from the Ethical Review Committee (ERC) of the Faculty of Medicine, University of Jaffna, Sri Lanka. Written informed consent from participants was obtained to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.