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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.

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There are 60,000 miles of blood vessels in every adult human.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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