Authors’ contributions
Faming Pan and Yubo Ma executed the research work and are accountable for the data quality and accuracy. Faming Pan and Yubo Ma contributed to the study design, data acquisition, statistical analysis and draft manuscript. Dazhi Fan, Shanshan Xu, Jixiang Deng, Xing Gao and Xu Zhang prepared manuscript preparation, acquired data and diagnosed patients. All authors had access to the extracted data in the study and agree to the conclusions made. All authors approved the manuscript.