Article History
Received: 3 April 2018
Accepted: 7 January 2019
First Online: 15 January 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were approved by the Survey and Behavioral Research Ethics Committee of the Chinese University of Hong Kong (ref. number: 14603015).
: Informed consent was obtained from all individual participants included in the study.