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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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Illicit drug use costs the United States approximately $181 billion every year.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.