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Vaccines prevent between 2.5 and 4 million deaths every year.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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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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The horizontal fraction bar was introduced by the Arabs.