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Authors
Tang, Tao
Tang, Nujiang
Zheng, Yongping
Wan, Xiangang
Liu, Yuan
Liu, Fuchi
Xu, Qinghua
Du, Youwei
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Article History
Received: 12 August 2014
Accepted: 21 January 2015
First Online: 13 February 2015
Competing interests
: The authors declare no competing financial interests.
