Dong Ning,1,* Lin Zhou,2,* Guidong Shi,1 Maoyong Fu1 1Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, People’s Republic of China; 2Department of Ultrasound, Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, People’s Republic of China *These authors contributed equally to this work Correspondence: Dong Ning, Department of Thoracic Surgery, Affiliated Hospital of North Sichuan Medical College, No. 1,...