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Authors
Cao, Fangyu
Liu, Ying
Xu, Jiajun
He, Yadong
Hammouda, B.
Qiao, Rui
Yang, Bao
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Article History
Received: 27 July 2015
Accepted: 23 September 2015
First Online: 4 November 2015
Competing interests
: The authors declare no competing financial interests.
