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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
The longest a person has survived after a heart transplant is 24 years.
There are 20 feet of blood vessels in each square inch of human skin.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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