- Correspondence to Mr Manjula Weerasinghe, Department of Community Medicine, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Saliyapura, Anuradhapura 50008, Sri Lanka;
- Received January 6, 2015
- Revised February 2, 2016
- Accepted February 25, 2016
- First published March 22, 2016.
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