Article History
Received: 18 January 2018
Accepted: 30 April 2018
First Online: 5 May 2018
Ethics approval and consent to participate
: Eligible sample of participants were informed and written informed consent was obtained. Ethical approval was obtained from Faculty of Medicine, University of Jaffna, Sri Lanka. (J/ERC/16/72/NDR/0143). Participants received instructions for opting out of the survey.
: The authors declare that they have no competing interests.
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