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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.
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There are approximately 3 million unintended pregnancies in the United States each year.
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The horizontal fraction bar was introduced by the Arabs.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.