When Doris Snyder celebrated her 102nd birthday on August 10, she was that much closer to the expected birth of her first great-granddaughter who's due to arrive early September. She is very excited about the milestone, which might not have been possible were it not for a cutting-edge, experimental procedure that replaced one of Doris' heart valves weeks earlier when she was 101. The valve had been rendered useless by aortic valve stenosis hardening from calcium deposits that restrict the flow of blood from the heart... 
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