| Sample |
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| • | Sample
size, ratio of controls to cases, |
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| different
kinds of comparison groups |
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| • | Types
of controls (hospital, community, |
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| RDD, screened,
etc.) |
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| • | Geographical
location, age group, gender |
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| • | Dates
when data were collected (time from |
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| data
collection to publication may vary) |
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