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A primer on how clinical studies work, develop

By Gina Kolata / The Bulletin
October 19, 2008

Everyone, it seemed, from the general public to many scientists, was enthralled by the idea that beta carotene would protect against cancer. In the early 1990s, the evidence seemed compelling that this chemical, an antioxidant found in fruit and vegetables and converted by the body to vitamin A,....

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