1. Department of Radiology, Affiliated Hospital of Zunyi Medical University, Medical Imaging Center of Guizhou Province, Huichuan District, Zunyi, Guizhou, P. R. China
2. Department of Anesthesiology, Affiliated Hospital of Zunyi Medical University, Huichuan District, Zunyi, Guizhou, P. R. China
3. Department of Thoracic Surgery, Affiliated Hospital of Zunyi Medical University, Huichuan District, Zunyi, Guizhou, P. R. China
4. Department of Pathology, Zunyi Maternal and Child Health Care Hospital, Honghuagang District, Zunyi, Guizhou, P. R. China.