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Authors
Wu, Pinghua
Li, Zeyu
Liu, Chang
Ouyang, Jun
Zhong, Shizhen
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Article History
Received: 14 October 2014
Accepted: 29 June 2015
First Online: 12 July 2015
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Our study complies with the current laws of our country and regulations of the university. At the same time, all process is permitted by local ethics committee.
