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Authors
Dai, Yan
Jia, Ping
Fang, Yi
Liu, Hong
Jiao, Xiaoyan
He, John C.
Ding, Xiaoqiang
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Article History
Received: 28 October 2015
Accepted: 9 May 2016
First Online: 2 June 2016
Competing interests
: The authors declare no competing financial interests.
