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Aortic Valve Replacement

The heart is a beating muscle that pumps blood throughout the body. Inside the heart, four valves direct blood flow. Two valves control the flow of blood from the upper chambers, or atria, to the lo...
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Many Teens 'Vaping' for Flavor, Not Nicotine

Study found that only about a fifth of 12th graders who used an e-cigarette used a nicotine substance

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