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Authors
Zhang, Wenjing
Li, Xiaojian
Zou, Ruitao
Wu, Huizi
Shi, Haiyan
Yu, Shanshan
Liu, Yong
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Article History
Received: 3 February 2015
Accepted: 8 May 2015
First Online: 8 June 2015
Competing interests
: The authors declare no competing financial interests.
