Critical Analysis in Medicine

[1]

[2]

[3]

References

  1. ↑ http://www.smokershistory.com/confound.htm
  2. ↑ [Reference Guide on Epidemiology|[] by Linda A. Bailey, Leon Gordis and Michael Green
  3. ↑ Reference guide on Epidemiology|[]by Michael D. Green, d. Michal Freedman, and Leon gordis
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