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D000368:Aged; D000075202:Contraindications; D006349:Heart Valve Diseases / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation / Q000379:methods* / Q000592:standards / Q000639:trends; D006801:Humans; D019060:Minimally Invasive Surgical Procedures / Q000639:trends; D012307:Risk Factors