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Authors
Wang, Tian-Yin
Liu, Ying-Zhao
Wei, Chun-Yan
Cai, Xiao-Qiu
Ma, Jian-Feng
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Article History
Received: 4 January 2017
Accepted: 12 April 2017
First Online: 30 May 2017
Competing Interests
: The authors declare that they have no competing interests.
