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Authors
Nian, Yin
Yang, Jing
Liu, Tong-Yang
Luo, Ying
Zhang, Ji-Hong
Qiu, Ming-Hua
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Article History
Received: 2 October 2014
Accepted: 13 February 2015
First Online: 12 March 2015
Competing interests
: The authors declare no competing financial interests.
