Funding for this research was provided by:
the National Natural Science Foundation of China (31671156)
the China Postdoctoral Science Foundation (2017M622249)
Article History
Received: 20 June 2018
Accepted: 1 September 2018
First Online: 21 September 2018
Compliance with Ethical Standards
:
: The 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.