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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.