Ethical approval
The study protocol was approved by the Institutional Review Board of the National University of Singapore (NUS-IRB-2020-362) prior to commencement. Study participants were presented with the Participant Information Sheet and Informed Consent Form at the beginning of the online survey. Participants provided consent by checking a box at the end of the Consent Form. Only those who provided consent were presented with the survey questionnaires and the intervention material. The consent process was approved by the ethics committee. Several pieces of personal information were collected from consenting participants, including name, student ID, email address, and phone number. These personal data were collected, processed, and stored by NUS Institute for Applied Learning Sciences and Educational Technology (ALSET) in accordance with University’s Research Data Management Policy. The authors received an anonymized copy of the survey responses with all identifiable information removed. None of the authors had access to participants’ names, student IDs, or email addresses during or after data collection. The first author (PLT) had access to students’ phone numbers for the purpose of administering the $15 health voucher; however, the phone number data were never linked to the anonymized survey responses and were used solely for administering the voucher. These protocols regarding privacy and data confidentiality were included in the Participant Information Sheet and approved by the ethics committee.