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Article History

Received: 13 June 2017

Accepted: 27 December 2018

First Online: 14 January 2019

Ethics approval and consent to participate

: The ethical clearance was approved by the Ethics Review Committee, Faculty of Medicine, University of Peradeniya, Sri Lanka. Permission was obtained from administrative and health authorities to conduct the study. All of the participants who participated voluntarily were signed an informed consent after describing the purposes and procedures in this study in their native languages. Their identities will be kept strictly confidential.

: Not applicable.

: The authors declare that they have no competing interests.

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