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The order of the authors was incorrectly listed as Maosheng Xu, Hongquan Geng, Guofeng Xu, Xiaoliang Fang, Lei He and Houwei Lin. The correct order is Houwei Lin, Hongquan Geng, Guofeng Xu, Xiaoliang Fang, Lei He and Maosheng Xu. The correct corresponding author is Maosheng Xu xumaosheng@xinhuamed.com.cn.
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
