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Authors
Ullah, Shahid
Lin, Shaofeng
Xu, Yang
Deng, Wankun
Ma, Lili
Zhang, Ying
Liu, Zexian
Xue, Yu
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Article History
Received: 13 January 2016
Accepted: 8 March 2016
First Online: 24 March 2016
Competing interests
: The authors declare no competing financial interests.
