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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.