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Here, age is our confounding factor, because older people are more likely to be inactive (called exposure), and this as well is associated with the outcome (because older people are at greater risk of developing heart disease)

The patient underwent video-assisted thoracoscopic surgery for a right-sided bulla resection and pleurodesis

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By Irin Maini Is IQOS Better than Cigarettes

Advocates say in the 1950s, less than 10% of Black smokers used menthol cigarettes, a number that has climbed to 85% after decades of marketing the products to Black smokers, according to the Campaign for Tobacco Free Kids

Aluminium production (13 percent) was another significant source of SO 2 (see Indicator: Air pollutant emissions)