Methodologic issues regarding background mortality in observational studies
نویسندگان
چکیده
منابع مشابه
Methodologic issues regarding the use of three observational study designs to assess influenza vaccine effectiveness.
BACKGROUND Influenza causes substantial morbidity and annual vaccination is the most important prevention strategy. Accurately measuring vaccine effectiveness (VE) is difficult. The clinical syndrome most closely associated with influenza virus infection, influenza-like illness (ILI), is not specific. In addition, laboratory confirmation is infrequently done, and available rapid diagnostic test...
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ژورنال
عنوان ژورنال: The Journal of Thoracic and Cardiovascular Surgery
سال: 2011
ISSN: 0022-5223
DOI: 10.1016/j.jtcvs.2011.07.063