Text and Data Mining valid from 2018-11-09
Received: 13 April 2018
Accepted: 15 October 2018
First Online: 9 November 2018
Ethics approval and consent to participate
: The study protocol was reviewed by the Ethics Board of the National University of Singapore Institutional Review Board (NUS-IRB Ref Code: B-16-095) and the approval was dated 6 June 2016. Written informed consent was obtained from every participant and confidentiality was strictly maintained. All data were anonymized and maintained according to Ethics Board guidelines.
: Not applicable.
: The authors declare that they have no competing interests.
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