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Authors
Wu, Di
Xie, Jun
Wang, Xuejun
Zou, Bingcheng
Yu, Yin
Jing, Tao
Zhang, Songmei
Zhang, Qing
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Article History
Received: 8 April 2015
Accepted: 4 August 2015
First Online: 2 September 2015
Competing interests
: The authors declare no competing financial interests.
