Contribution to authorship
Wei Huang and Xiangdong Kong could refer to all of the data in the study
and take responsibility for the the accuracy of the data analysis. Wei
Huang, Xiaofan Zhu and Xiangdong Kong thought and designed the study.Wei
Huang,Yanfei Wang,and Zhi Gao contributed to data collection and
confirmation. Wei Huang and Xiaofan Zhu contributed to data analysis,
and Wei Huang contributed to data interpretation. Wei Huang were in
charge of writing the manuscript draft.