Funding for this research was provided by:
Chinese University of Hong Kong - Shenzhen (PF.01.000670)
Article History
Received: 13 August 2019
Accepted: 17 December 2019
First Online: 2 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Ethical approval was obtained from the Hunan University (the first author’s previous affiliation). All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Written informed consent was obtained from all the surveyed participants.