Valvular disease in the elderly: influence on surgical results.
Davis EA, Gardner TJ, Gillinov AM, Baumgartner WA, Cameron DE, Gott VL, Stuart RS, Watkins L, Reitz BA. Valvular disease in the elderly: influence on surgical results. Ann Thorac Surg. 1993 Feb; 55(2):333-7; discussion 337-8.