1. Department of Respiratory Medicine, First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, P.R. China.
2. Department of Pathology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, P.R. China.
3. Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Tianjin Medical University, Tianjin, 300070, P.R. China.
4. Department of Thoracic Surgery, First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, P.R. China.