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A mainstay of health research today, these studies compare two cohorts of people: the cases, who all have a particular disease or condition, and the controls, who are as similar to the cases as possible but, crucially, dont have the disease

If he does not receive the unconditional knockdown within this period, his bid expires

Useful when you don't want it to be obvious that you're smoking

Despite improvements in tracking technology, these unfortunate events still do happen and can put a killjoy on your travel plans

In a recent study, carcinogenic biomarkers have been detected in the urine of e-cigarette users

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