A Cohort Study of the Effectiveness of Influenza Vaccine in Older People, Performed Using the United Kingdom General Practice Research Database
2004 ◽
Vol 190
(1)
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pp. 1-10
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2008 ◽
Vol 169
(3)
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pp. 382-388
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2004 ◽
Vol 111
(4)
◽
pp. 369-376
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2008 ◽
Vol 137
(1)
◽
pp. 38-47
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2006 ◽
Vol 28
(3)
◽
pp. 388-395
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