A longitudinal study of mitral regurgitation detected after acute myocardial infarction by Sharma, H, Yuan, M, Shakeel, I, Hodson, J, Radhakrishnan, A, Brown, S, May, J, O'Connor, K, Zia, N, Doshi, SN, Hothi, SS, Townend, JN, Myerson, SG, Ludman, PF, Steeds, RP, Nadir, MA