Incentives and ethical considerations
MINOR, -11
After data collection at T3, all identifiable data were completely discarded. Participation was voluntary, and as an incentive, the participants were entered into six separate random prize drawings for 50 Saudi Riyals (USD 13.33) in the form of local bookstore gift cards. Before participating in the intervention, all participants have to approve the study’s informed consent form, by clicking “approve” on the electronic consent format. No witness was there to witness their approval, as their participation was done electronically. There are no minor participants in this study. The study was approved by the institutional review board of Umm Al-Qura University with the number HAPO-02-K-012-2021-11-810, which follows Declaration of Helsinki. This study was registered in the ISRCTN registry with the number ISRCTN13915540 (registration data 10/11/2021), which can be accessed at 