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In the previous studies, we have designed the Self-evaluation Scoring Questionnaire for High-risk Individuals of Lung Cancer. In order to make a better understanding of the status of risk factors of lung cancer for residents in Chengdu, we carried out the investigation from June 2009 to December 2009.

[A cross-sectional investigation on risk factors of lung cancer for residents over 40 years old in Chengdu, Sichuan Province, China].