Funding for this research was provided by:
National Research Council Sri Lanka (13-108)
Received: 24 August 2020
Accepted: 4 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the Ethical Review Committee (ERC) of the Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka and individual hospital ERCs. Informed written consent was obtained from all the study participants.
: Not applicable.
: The authors declare they have no competing interests.