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A more efficient, although rarely used, approach (Cornfield, 1951) is to combine measures of odds ratio (OR) from casecontrol studies with relevant incidence or mortality data

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In our study molecular markers associated with squamous metaplasia were increased in EC users, suggesting ECs might interfere with the recovery of squamous metaplasia in former smokers

People typically start to smoke before the age of 20, but arent admitted to hospital with a mental disorder until theyre between 30 and 60 on average." "Smoking typically comes before the mental illness

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