Analysis of the stone can help in developing a plan to decrease the risk of future stones.

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But in the weeks and months ahead, we will continue a sustained and intensive effort of analysis and assessment so we leave no stone unturned in seeking better ways to protect the American people.

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Gregg W. Stone, a professor of medicine at Columbia University and the author of an analysis of Boston Scientific's stent published in the New England Journal, says that is worried that doctors have pulled back too much from using drug coated stents, in even off-label uses.

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