Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2014A030310213)
Article History
Received: 9 April 2019
Accepted: 10 October 2019
First Online: 19 October 2019
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: All procedures performed in studies 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.
: Informed consent was obtained from all individual participants included in the study.