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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.