Received: 27 March 2020
Accepted: 7 July 2020
First Online: 23 July 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Review Committee of the Faculty of Medicine, University of Kelaniya (P/155/10/2015). The confidentiality of the acquired data was maintained throughout the study.
: All the authors have read and approved the paper for publication.
: The authors have declared that they have no competing interests.