| http://www.w3.org/ns/prov#value | - So Bertone-Johnson and her colleagues wondered if diets high in calcium could actually prevent the onset of PMS. The team turned to survey data from the more than 116,000 women registered in a major ongoing study, Nurses Health Study II. They selected 1057 women who reported a diagnosis of PMS and 1968 matched women with no such diagnosis to serve as a comparison.
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