Funding for this research was provided by:
Norges Forskningsråd (220893)
Text and Data Mining valid from 2018-06-07
Received: 27 January 2018
Accepted: 31 May 2018
First Online: 7 June 2018
Ethics approval and consent to participate
: The study was approved on 27 March 2014 by the Ethics Review Committee (ERC), University of Sri Jayewardenepura, Gangodawila, Nugegoda, Sri Lanka – Ref. 08/14. All participants gave written informed consent to take part in the study.
: The authors declare that they have no competing interests.
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