Funding for this research was provided by:
National Cancer Institute (Intramural Research Program)
Received: 23 August 2019
Accepted: 30 March 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: Written, informed consent from all study participants and ethical clearance to conduct this study was obtained from the Ethics Review Committee, Faculty of Medicine, University of Colombo [EC-13-182].
: Not applicable.
: The authors declare that they have no competing interests.