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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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There are approximately 3 million unintended pregnancies in the United States each year.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.