RT Journal Article SR Electronic T1 The heterogeneity of Streptococcus viridans: therapeutic considerations in infective endocarditis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1217 OP 1219 VO 112 IS 10 A1 J. Fisher A1 D. L. Levene YR 1975 UL http://www.cmaj.ca/content/112/10/1217.abstract