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Full-blown obsessive symptoms seen in both younger, older children, study finds.
Finding could sidestep ethical concerns surrounding use of cells from embryos.
Injected into mice, it proved more effective but with fewer side effects, study says.
Study found it detected twice as many malignancies, serious precancerous polyps.
Experts seeing more cases of sleeplessness, anxiety, but they offer tips for coping.
Big gaps exist between states, and between poor, middle- and upper-class families, study finds.
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