Funding for this research was provided by:
National Natural Science Foundation of China (31570635)
National Natural Science Foundation of China (31500431)
National Natural Science Foundation of China (31270535)
Outstanding Youth Science Foundation of Heilongjiang Province (JC201306)
Article History
Received: 31 January 2018
Accepted: 19 October 2018
First Online: 21 November 2018
Ethics approval and consent to participate
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: The authors declare that they have no competing interests.
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