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Associated Press
In May 23, 2012 photo, Dr. Manesh Patel, an interventional cardiologist at Duke Heart Center, speaks with resident doctors at Duke University Hospital in Durham, N.C. Patel is participating in a research study of a way to treat high blood pressure by threading a catheter to the kidney and zapping nearby nerves that fuel blood pressure. Duke is one of more than 60 hospitals taking part in the clinical trial of what’s called renal denervation. (AP Photo/Gerry Broome)

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