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Strengths of our study include age and sex matching of cases and controls, and the ability to examine a variety of other factors which may be associated with non-participation including marital status, employment, income and others. Some limitations of our study include the relatively small sample size and lack of information on attitudes towards research. Individual income information that was not available was inferred from postal codes. While this method is used commonly in epidemiologic studies, it is subject to misclassification under a variety of conditions.
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