Received: 20 December 2021
Accepted: 29 April 2022
First Online: 13 May 2022
: The study (involving humans) was performed in accordance with the Declaration of Helsinki. Ethical approval was granted by the Ethics Committee of the Hong Kong Polytechnic University (Reference number: HSEARS20210604001). Informed consent to participate in the study was obtained from all of the subjects and/or their legal guardian(s).
: Not applicable.
: The authors declare that they have no competing interests.