| http://www.w3.org/ns/prov#value | - Dr. Steen explained to Missy and Bill that while his arteries looked fine, he needed a surgeon to replace his aortic valve. ???Valve surgeries are complex, so you don???t want someone who only does two or three a year,??? Dr. Steen said. ???You want someone who is very skillful and comfortable implanting all types of valves, whether mechanical or derived from animal tissue.???
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