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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.