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Authors
Wu, Di
Shen, Rui
Yang, Rong
Ji, Wenxu
Jiang, Meng
Ding, Weiping
Peng, Luming
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Article History
Received: 10 August 2016
Accepted: 13 February 2017
First Online: 15 March 2017
Competing interests
: The authors declare no competing financial interests.
