1. Department of Respiratory Disease, First Affiliated Hospital of Guangxi Medical University, No. 6 Shuangyong Road, Nanning 530021, China
2. Department of Respiratory Disease, Tenth Affiliated Hospital of Guangxi Medical University, Qinzhou 535000, China
3. Department of Radiology, Tenth Affiliated Hospital of Guangxi Medical University, Qinzhou 535000, China