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To rule out confounding, observational studies of influenza vaccine need to include analyses during the 'preinfluenza period'.

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Bibliographic Details
Title: To rule out confounding, observational studies of influenza vaccine need to include analyses during the 'preinfluenza period'.
Authors: Jackson ML (AUTHOR), Weiss NS (AUTHOR), Nelson JC (AUTHOR), Jackson LA (AUTHOR)
Source: Archives of Internal Medicine. 7/23/2007, Vol. 167 Issue 14, p1553-1554. 2p.
Database: Academic Search Ultimate
Description
ISSN:00039926
DOI:10.1001/archinte.167.14.1553-b