Funding for this research was provided by:
The Centre for Health Protection, Department of Health, the HKSAR (CHEU/MHWBS/2015)
Received: 28 January 2021
Accepted: 15 April 2021
First Online: 28 April 2021
: All procedures involving human subjects/patients were approved by the Survey and Behavioural Research Ethics of the CUHK (Project Reference No: CHEU/MHWBS/2015). Interviewers informed respondents of the nature and purpose of each survey, voluntary participation, and anonymity as well as confidentiality of information collected at the beginning of the interview. Respondents were asked to give verbal consent before proceeding, and parental verbal consent was obtained before conducting interview with respondents who aged below 18. An enquiry telephone number of each survey was provided to respondents.
: Not applicable.
: The authors declare that they have no competing interests.