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Authors
He, Qinghua
Liu, Yixi
He, Yonghong
Zhu, Liang
Zhang, Yilong
Shen, Zhiyuan
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Article History
Received: 19 April 2016
Accepted: 14 October 2016
First Online: 3 November 2016
Competing interests
: The authors declare no competing financial interests.
