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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.