1. Office of National Central Cancer Registry, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
3. Department of Epidemiology and Biostatistics School of Public Health, Xi'an Jiaotong University Health Science Center Xi'an Shaanxi China
4. Section of Environment and Radiation, International Agency for Research on Cancer Lyon France
5. Department of Endoscopy Cancer Institute/Hospital of Linzhou Linzhou China
6. Department of Pathology Cancer Institute/Hospital of Linzhou Linzhou China
7. Department of Epidemiology Cancer Institute/Hospital of Linzhou Linzhou China