Authors’ contributions
Ms. Miao Yuan was responsible for querying and analyzing the data and was a major contributor in writing the manuscript. Dr. DengFeng Gao was responsible for interpreted the patient data. Dr. Fuxian Ren responsible for the point to point response and the statistics. Mr. BinChen Ren was responsible for the revision of the manuscript. Ms. Yu Wang responsible for drawing and modification of figures and tables. All authors read and approved the final manuscript.