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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Medication errors are three times higher among children and infants than with adults.
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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.