1. Department of Oncology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
2. Department of Etiology and Carcinogenesis and State Key Laboratory of Molecular Oncology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences (CAMS) & Peking Union Medical College (PUMC), Beijing, China
3. Beijing Key Laboratory for Carcinogenesis and Cancer Prevention, Beijing, China
4. Current address: Department of Pathology, Beijing ChaoYang Hospital, Capital Medical University, Beijing, China
5. Department of Cancer Epidemiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences (CAMS) & Peking Union Medical College (PUMC), Beijing, China