Funding for this research was provided by:
Innovation and Technology Commission - Hong Kong (ITT/039/14GP, ITS/033/12)
Hong Kong Polytechnic University (1-ZE4R)
Text and Data Mining valid from 2019-06-03
Received: 21 September 2018
Accepted: 16 May 2019
First Online: 3 June 2019
Ethics approval and consent to participate
: The human experiments were conducted after we obtained the ethical approval from the Human Subjects Ethics Sub-Committee of the Hong Kong Polytechnic University and the written informed consent from all subjects.
: Not applicable.
: The authors declare no competing interests related to this study.