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Article History

Received: 11 November 2017

Accepted: 14 March 2018

First Online: 2 April 2018

Ethics approval and consent to participate

: Ethical approval for the current study was obtained from The Institutional Review Board at Nanyang Technological University (NTU), Singapore (Ref: IRB-2016-01-032). Since the study was originally planned to conduct as a cluster-randomized controlled trial, the original plan had to be changed due to great difficulty in recruiting schools. The amended study design was also approved by NTU Institutional Review Board (Ref: IRB-2016-01-032-01). Students were asked to pass the information sheets and informed consent forms to their parents and discuss their participation in the study with them. Students who gave their consent and returned the informed consent forms signed by their parent were eligible to participate in the study.

: Not applicable.

: The authors declare that they have no competing interests.

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