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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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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.