1. Department of Respiratory; The First Affiliated Hospital of Zhengzhou University; Zhengzhou 450052 People's Republic of China
2. Institute of Clinical Medicine; The First Affiliated Hospital of Zhengzhou University; Zhengzhou 450052 People's Republic of China
3. Department of Oncology; The First Affiliated Hospital of Zhengzhou University; Zhengzhou 450052 People's Republic of China
4. Pingdingshan Industrial College of Technology; Institute of international communication; Pingdingshan 467000 People's Republic of China