Ethical Considerations
EMA
Ethics approval was obtained from the National Healthcare Group in Singapore (reference 2019/00285). All participants provided written informed consent before commencing the study and consented for their deidentified data to be used for research purposes. For this study, the maximum compensation available to participants ranged from SG $21 (US $15) to SG $34.66 (US $25) depending on group allocation during the reward RCT and on the number of EMA surveys they completed.