Study population
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A) Description of source population
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1
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B) Valid inclusion and exclusion criteria
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1
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C) Sufficient description of baseline characteristics
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1
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Follow-up
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D) Follow-up of at least 1 year
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1
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E) Prospective or retrospective data collection
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1
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F) Loss to follow-up ≤20 %
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1
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G) Information about loss to follow-up (selective for age, sex or severity)
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1
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Exposure
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H) Exposure assessment blinded for the outcome
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1
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I) Exposure measured identically in the studied population at baseline and follow-up
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1
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Outcome
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J) Outcome assessment blinded for exposure
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1
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K) Outcome measured identically in the studied population at baseline and follow-up
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1
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Analysis
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L) Measure of association or measures of variance given
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1
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M) Adjusted for age, sex and severity
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1
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