Ethical Approval Statement

Each stage of the current study received approval from the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW 18-057).

Participant Consent

Written informed consent and informed assent were obtained from participants and their parents.

Financial Disclosure

All authors have indicated they have no financial relationships relevant to this article to disclose.

Conflicts of interests

All authors have indicated they have no potential conflicts of interest to disclose.