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Authors
Gao, Ling
Pang, Chao
He, Dafang
Shen, Liming
Gupta, Arunava
Bao, Ningzhong
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Article History
Received: 23 March 2015
Accepted: 5 October 2015
First Online: 10 November 2015
Competing interests
: The authors declare no competing financial interests.
