Influenza mortality and hospital admissions for influenza, pneumonia, emphysema and bronchitis during the influenza epidemic 1989-90 : case-control study of risk-factors and effectiveness of influenza vaccine
General practitioners' records for 315 subjects whose primary or contributory cause of death was influenza between November 4, 1989 and February 23, 1990, and 777 controls, matched for age, sex, and area of residence, who died a year after the epidemic were reviewed. Information was collected o...
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University of Leicester
1997
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| Online Access: | http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.696194 |