Ji, Xiao-Peng
Cao, Xian-Bin
Du, Wen-Bo
Tang, Ke
Funding for this research was provided by:
National Science Fund for Distinguished Young Scholars of China (61425014)
National Natural Science Foundation of China (91538204)
Foundation for Innovative Research Groups of the National Natural Science Foundation of China (61521091)
Article History
First Online: 5 July 2016
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.