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Authors
Yu, Lifang
Yang, Yiyuan
Li, Zhaohong https://orcid.org/0000-0001-6463-7666
Zhang, Zhenzhen
Cao, Gang
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61702034)
National Natural Science Foundation of China (61401408)
Beijing Municipal Commission of Education (KM201510015010)
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Article History
Received: 1 November 2018
Accepted: 16 May 2019
First Online: 29 May 2019
Competing interests
: The authors declare that they have no competing interests.
