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Authors
Niu, Chengcheng
Xu, Yan
An, Senbo
Zhang, Ming
Hu, Yihe
Wang, Long
Peng, Qinghai
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Article History
Received: 11 April 2017
Accepted: 7 June 2017
First Online: 14 July 2017
Competing Interests
: The authors declare that they have no competing interests.
