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Authors
Ma, Zengxin
Tan, Yanzhen
Cui, Guzhen
Feng, Yingang
Cui, Qiu
Song, Xiaojin
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Article History
Received: 2 April 2015
Accepted: 28 August 2015
First Online: 25 September 2015
Competing interests
: The authors declare no competing financial interests.
