Funding for this research was provided by:
University of Peradeniya, Sri Lanka (RG/AF/2013/38/M)
Text and Data Mining valid from 2019-04-04
Received: 7 February 2019
Accepted: 14 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethical Review Committee of the Faculty of Medicine, University of Peradeniya, Sri Lanka. An informed written consent was obtained from the parents/guardians of the study participants.
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