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Authors
Guo, Li
Tan, Guangguo
Liu, Ping
Li, Huijie
Tang, Lulu
Huang, Lan
Ren, Qian
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Article History
Received: 2 April 2015
Accepted: 17 September 2015
First Online: 13 October 2015
Competing interests
: The authors declare no competing financial interests.
