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Authors
Gao, Zhi-Da
Qu, Yongfang
Li, Tongtong
Shrestha, Nabeen K.
Song, Yan-Yan
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Article History
Received: 5 August 2014
Accepted: 14 October 2014
First Online: 4 November 2014
Competing interests
: The authors declare no competing financial interests.
