1. Office of Cancer Screening National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 P. R. China
2. Department of Anesthesia National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 P. R. China
3. Office of Cancer Registry National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 P. R. China
4. Department of Public Health Gansu Wuwei Tumor Hospital Wuwei Gansu 733000 P. R. China
5. Department of Cancer Epidemiology Henan Office for Cancer Control and Research The Affiliated Cancer Hospital of Zhengzhou University Henan Cancer Hospital Zhengzhou Henan 450000 P. R. China
6. Linzhou Institute for Cancer Prevention and Control Linzhou Cancer Hospital Linzhou Henan 456500 P. R. China
7. Cixian Institute for Cancer Prevention and Control Cixian Cancer Hospital Handan Hebei 056500 P. R. China
8. Department of Thoracic Surgery National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 P. R. China