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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71501006)
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Article History
First Online: 28 August 2019
Compliance with ethical standards
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: Hong Fang declares that she has no conflict of interest. Jing Li declares that she has no conflict of interest. Wenyan Song declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.
