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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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There are approximately 3 million unintended pregnancies in the United States each year.

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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

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