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Authors
Du, Ting
Cai, Kaimei
Han, Heyou
Fang, Liurong
Liang, Jiangong
Xiao, Shaobo
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Article History
Received: 9 July 2015
Accepted: 12 October 2015
First Online: 10 November 2015
Competing interests
: The authors declare no competing financial interests.
