Article History
Accepted: 30 April 2021
First Online: 19 May 2021
Compliance with Ethical Standards
:
: The authors declare no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Human Research Ethics Committee of The University of Hong Kong.
: Written informed consent was obtained from the parents/guardians of the participants.