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参考文献

[1]dos Santos Silva I.Cancer Epidemiology:Principles and Methods[M].Lyon:International Agency for Research on Cancer,1999.

[2]Rothman,KJ,Greenland S,Lash TL.Modern Epidemiology[M].3rd ed.Philadelphia:Lippincott Williams & Wilkins,2008.

[3]Miquel P(Ed).A dictionary of epidemiology[M].6th ed.Oxford:Oxford University Press,2014.

[4]Levin KA.Study design Ⅲ:Cross-sectional studies[J].Evidence-based dentistry,2006,7(1):24-25. GEB6z9xX96jbRmHeC47IZpoFBreghp5BfBcPC4CBm+PJXtUWj+1K/U16HsYN23rN

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