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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (81272681)
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Article History
Received: 18 May 2018
Accepted: 4 September 2018
First Online: 10 September 2018
Compliance with ethical standards
:
: All authors listed in the manuscript have concurred with the content of the manuscript and this submission. No conflict of interest was excited between the authors.
: 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.
: For this type of study, formal consent is not required.
