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Authors
Chu, Xin-Ling
Feng, Ming-Guang
Ying, Sheng-Hua
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (31171898)
National Natural Science Foundation of China (31371990)
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Article History
Received: 6 August 2015
Revised: 23 August 2015
Accepted: 24 August 2015
First Online: 2 September 2015
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.
