Funding for this research was provided by:
Ministry of Education of the People's Republic of China (13YJA880022, DCA110195)
Chinese Scholarship Council (201506040139)
Article History
First Online: 24 January 2019
Compliance with Ethical Standards
:
: Author Xiaoming Zhai declares that he has no conflict of interest. Author Min Li declares that she has no conflict of interest. Author Siwei Chen declares that she has 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. This article does not contain any studies with animals performed by any of the authors.