Funding for this research was provided by:
School of Science and Technology Unit Fund, The Open University of Hong Kong (ST-17/18-1)
S. Living Campaign 2017, Wofoo Community Service Network, Wofoo Social Enterprises (NA)
Text and Data Mining valid from 2020-04-14
Received: 9 August 2019
Accepted: 9 March 2020
First Online: 14 April 2020
Ethics approval and consent to participate
: The study procedures were carried out in accordance with the Declaration of Helsinki. The Institutional Review Board of the University Research Centre, The Open University of Hong Kong (HE20Jul2017-S&T2017/01), approved the study. All subjects were informed about the study and all provided with appropriate types of informed consents.
: Not applicable.
: The authors declare that they have no competing interests.