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Epidemiology. 2012 Mar;23(2):350-1; author reply 351-2. doi: 10.1097/EDE.0b013e318245912c.

Negative control exposures in epidemiologic studies.

PMID:
22317815
DOI:
10.1097/EDE.0b013e318245912c
[Indexed for MEDLINE]

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