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Authors
Ma, Yingyan
He, Xiangui
Zhu, Xiaofeng
Lu, Lina
Zhu, Jianfeng
Zou, Haidong
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Article History
Received: 2 October 2015
Accepted: 8 March 2016
First Online: 23 March 2016
Competing interests
: The authors declare no competing financial interests.
