1 Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, China.
2 College of Clinical Medicine, North Sichuan Medical College, Nanchong, China.
3 Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, 63 Wenhua Rd, Shunqing District, Nanchong 637000, China. Electronic address: fumaoyongmd@126.com.