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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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Medication errors are more common among seriously ill patients than with those with minor conditions.