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Authors
Ji, Jian
Gu, Wenshu
Sun, Chao
Sun, Jiadi
Jiang, Hui
Zhang, Yinzhi
Sun, Xiulan
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Article History
Received: 21 January 2016
Accepted: 15 July 2016
First Online: 8 August 2016
Competing interests
: The authors declare no competing financial interests.
