Heart repair breakthroughs replace surgeon's knife

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Heart Repair
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Heart Repair
In this Monday, March 11, 2013 photo, Atlanta cardiologist Dr. Spencer King holds a replacement heart valve during a demonstration at an American College of Cardiology conference in San Francisco. Millions of people have valve problems - each year, more than 100,000 people in the United States alone have surgery for them. (AP Photo/Jeff Chiu)