Received: 10 June 2019
Accepted: 17 July 2019
First Online: 25 July 2019
Ethics approval and consent to participate
: Ethical aspects of this study were reviewed by the Ethical Review Committee of the Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka, which granted approval. Informed written consent will be taken from each participant before giving the questionnaire.
: Not applicable.
: The author declares no competing interests.