The number of cases has hit a 50-year high, and the disease, which was declared eliminated in the United States in 2000, has been reported in 22 states.
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Nationwide, the number of twin births has been on the rise, increasing by more than 75 percent over the past 30 years.
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Pregnant women with opioid use disorders often face a number of challenges during their pregnancies.
Do pregnant women need to worry about the way they sleep?
