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Authors
Song, Yan-feng
Liu, Dao-zhou
Cheng, Ying
Liu, Miao
Ye, Wei-liang
Zhang, Bang-le
Liu, Xin-you
Zhou, Si-yuan
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Article History
Received: 8 July 2015
Accepted: 9 October 2015
First Online: 4 November 2015
Competing interests
: The authors declare no competing financial interests.
