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Authors
Li, Na
Li, Yongmei
Gao, Qinqin
Li, Dawei
Tang, Jiaqi
Sun, Miao
Zhang, Pengjie
Liu, Bailin
Mao, Caiping
Xu, Zhice
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Article History
Received: 29 April 2015
Accepted: 21 July 2015
First Online: 17 August 2015
Competing interests
: The authors declare no competing financial interests.
