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Authors
Ding, Jiexia
Li, Meng
Wan, Xingyong
Jin, Xi
Chen, Shaohua
Yu, Chaohui
Li, Youming
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Article History
Received: 30 January 2015
Accepted: 3 August 2015
First Online: 2 September 2015
Competing interests
: The authors declare no competing financial interests.
