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Authors
Peng, J
Shi, S
Yang, Z
Ding, Q
Hai, W
Tang, H
Yang, Y
Bernstein, J R
Peyda, P
Xu, Y
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Article History
Received: 28 November 2013
Revised: 11 March 2014
Accepted: 1 April 2014
First Online: 15 May 2014
Competing interests
: The authors declare no conflict of interest.
