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Authors
He, Weiwei
Han, Xiangna
Jia, Huimin
Cai, Junhui
Zhou, Yunlong
Zheng, Zhi
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Article History
Received: 18 October 2016
Accepted: 30 November 2016
First Online: 4 January 2017
Competing interests
: The authors declare no competing financial interests.
