Funding for this research was provided by:
National Natural Science Foundation of China (31572231)
Text and Data Mining valid from 2018-05-02
Received: 28 December 2017
Accepted: 16 April 2018
First Online: 2 May 2018
: This study was conducted according to the Hebei Normal University Experiments in Animals Policy and was approved by the Animal Ethics Committee of Hebei Normal University as complying with the Animal Protection Law of the People’s Republic of China.
: The authors declare that they have no competing interests.
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