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There are approximately 3 million unintended pregnancies in the United States each year.
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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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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The familiar sounds of your heart are made by the heart's valves as they open and close.