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The authors would like to make an addition to the “Acknowledgment section”. The corrected section is as follows:
Acknowledgments
Financial support of this work was provided by the National Key Technology Support Program of the People’s Republic of China, under grant number 2013BAI03B06. This research work was jointly supported by the Joint Specialized Research Fund for the Doctoral Program of Higher Education of the Ministry of Eduction of the People’s Republic of China under grant number 20132307110018, and the Graduate Student Innovation Research Project in Harbin Medical University of the People’s Republic of China under grant number YJSCX2015-32HYD.