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The horizontal fraction bar was introduced by the Arabs.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.