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Authors
Xu, Dongqing
Han, Qiuju
Hou, Zhaohua
Zhang, Cai
Zhang, Jian
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Article History
Received: 21 June 2015
Revised: 10 December 2015
Accepted: 21 December 2015
First Online: 21 March 2016
Competing interests
: The authors declare no conflict of interest.
