Received: 19 November 2019
Accepted: 14 April 2020
First Online: 11 May 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: 2018.242).
: Written informed consent was obtained from every participant.
: The authors declare that they have no competing interests.