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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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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.