Received: 4 March 2019
Accepted: 11 November 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: This study [HSEARS20130804001–01] was ethically approved by the Research Ethics Committee of the Hong Kong Polytechnic University, and the participants provided their informed written consent to participate.
: This study does not include details, images, or videos relating to an individual person.
: The authors received no financial support for the research, authorship, and/or publication of this article.