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Authors
Yang, Maiyun
Jalloh, Abubakar S.
Wei, Wei
Zhao, Jing
Wu, Peng
Chen, Peng R.
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Article History
Received: 1 June 2014
Accepted: 13 August 2014
First Online: 19 September 2014
Competing interests
: The authors declare no competing financial interests.
