1 Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, 1 South Maoyuan Rd, Nanchong, 637000, China.
2 Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, 1 South Maoyuan Rd, Nanchong, 637000, China. Electronic address: 22tiandong@163.com.