1. Department of Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
2. Department of Hematology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
3. Department of Respiratory Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China