Funding for this research was provided by:
University of Peradeniya (RG/AF/2013/D)
Received: 1 September 2019
Accepted: 6 August 2020
First Online: 20 August 2020
Ethics approval and consent to participate
: Ethical clearance for this study was obtained from the Ethics Review Committee of the Faculty of Dental Sciences, University of Peradeniya, Peradeniya, Sri Lanka (Ethical Clearance Certificate No FDS-FRC/2014/16). All participants were recruited on voluntary basis after obtaining their informed written consent.
: This is not applicable as none of the participants are identified in the manuscript.
: The authors declare that they have no competing interests.