2[2]Stafford WJ, Petch J, Radford DJ. Vegetations in infective endocarditis clinical relevance and diagnosis by cross sectional echocardiography. Br. Heart J, 1985,53: 310 - 313
3[3]Werner Gs, Schulz R, Fuchs JB, et al. Infective endocarditis in the elderly in the era of transesophageal echocardiography: Clinical features and prognosis compared with younger patients. Am. J. Med,1996,100(1) :90 - 97