Text and Data Mining valid from 2019-08-22
Received: 28 February 2019
Accepted: 15 August 2019
First Online: 22 August 2019
Ethics approval and consent to participate
: The ethical approval is obtained from The Hong Kong Polytechnic University (Reference Number: HSEARS20180519002).All participants’ consent was collected online. After reading the information sheet, people who agree to join in were required to click “Agree” button to start the survey, otherwise they would be regarded as do not agree to participate and the online survey would be unavailable.
: Not applicable
: The authors declare that they have no competing interests.