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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.