2.1. Design and Participants

A cross-sectional survey using structured questionnaires was conducted among college students from eight universities in Hong Kong. With a random sampling, college students were recruited at a balanced ratio between male and female. The eligible participants were (a) 18 years or above and (b) could speak fluent Chinese. A written consent form was obtained from the participants before taking part in the study, and no compensation was provided for this. The project has been approved by the Ethics of Honor Project at departmental level, the Education University of Hong Kong.