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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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The horizontal fraction bar was introduced by the Arabs.