Text and Data Mining valid from 2019-08-08
Received: 1 April 2019
Accepted: 30 July 2019
First Online: 8 August 2019
Ethics approval and consent to participate
: Parents of the participants were briefed about the study and informed written consent from guardians and assent from children over 12 years were obtained before recruiting into the study. Ethical approval was obtained from the Ethics Review Committee of University of Kelaniya, Sri Lanka.
: Not applicable.
: The authors declare that they have no competing interests.