English Heritage plan to take the Blue Plaque scheme to three more cities outside the capital in the near future.

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Four are top experts in the field of using ultrasound to take pictures of artery plaque.

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Davidson, the University of Chicago cardiologist, says this was allowable because using an easier-to-take measurement of carotid artery plaque would yield a clearer result.

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But the first signs of real proof are likely to come from several expensive imaging trials Pfizer is funding, including a large, two-year trial being by conducted by Steven Nissen of The Cleveland Clinic to measure changes in artery plaque in patients who take the drug.

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Darapladib, the drug to stabilize plaque in arteries, is typical of the gambles drug companies must take these days.

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The problem is that although plaque might build up in arteries quickly, as in Reversal, it can take a long time for people to develop heart problems, as is measured in Prove-It.

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