Chen, Xi
Zhao, Liu
Liang, Haiming
Funding for this research was provided by:
National Natural Science Foundation of China (71473188)
Natural Science Basic Research Plan in Shaanxi Province of China (2017JM7001)
the Fundamental Research Funds for the Central Universities (JB170606)
National Natural Science Foundation of China (71601133)
Article History
First Online: 10 March 2018
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.