RT Journal Article SR Electronic T1 Accuracy of clinical diagnosis versus echocardiography in evaluating heart murmurs. How to measure accuracy? JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 155 OP 155 VO 28 IS 1 A1 Afifi, Mustafa YR 2007 UL http://smj.org.sa/content/28/1/155.abstract