Funding for this research was provided by:
University of Peradeniya (URG/2016/96/M)
Received: 27 August 2020
Accepted: 4 June 2021
First Online: 15 June 2021
: Ethical approval for the study was obtained from the Ethics Review Committee, Faculty of Medicine, University of Peradeniya (2017/EC/29). Informed written consent was taken by study participants.
: Not applicable.
: Authors have declared no competing interest.