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Authors
Li, Xue-Mei
Liu, Hong-Ling
Liu, Xiao
Fang, Ning
Wang, Xian-Hong
Wu, Jun-Hua
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Article History
Received: 21 May 2015
Accepted: 14 October 2015
First Online: 9 November 2015
Competing interests
: The authors declare no competing financial interests.
