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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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