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Stevens, K B and Marr, C M and Horn, J N R and Pfeiffer, D U and Perkins, J D M and Bowen, I M and Allan, E J and Campbell, J and Elliott, J (2009) Effect of left-sided valvular regurgitation on mortality and causes of death among a population of middle-aged and older horses. VETERINARY RECORD, 164 (1). pp. 6-10.