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The longest a person has survived after a heart transplant is 24 years.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.