Received: 30 July 2020
Accepted: 22 October 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the ethics review board of the Joint NTEC/CUHK Ethics Committee (Research Ethics Committee approval number: CRE-2013.644-T).
: Written informed consent was obtained from every participant.
: The authors declare that they have no competing interests.