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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The average adult has about 21 square feet of skin.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.