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When Can You Say Something Causes Cancer?

caption: Artificial turf has been in the news lately for suspicions that it could contribute to certain types of cancer.
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Artificial turf has been in the news lately for suspicions that it could contribute to certain types of cancer.
Flickr Photo/Lisa Parker (CC-BY-NC-ND)

Marcie Sillman talks to Dr. Parveen Bhatti, environmental epidemiologist at the Fred Hutchinson Cancer Research Center, about how researchers determine causality.

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