1. Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Cancer Epidemiology, Peking University School of Oncology Peking University Cancer Hospital & Institute Beijing China
2. Department of Gastroenterology Gansu Wuwei Tumor Hospital Wuwei China
3. Cancer Epidemiology Research Center Gansu Provincial Cancer Hospital Lanzhou China
4. Department of General Surgery, The Affiliated Huai'an No.1 People's Hospital Nanjing Medical University Huai'an 223300 China
5. National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China