RT Journal Article SR Electronic T1 Stethoscopes JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 318 OP 318 DO 10.1136/hrt.80.4.318 VO 80 IS 4 A1 M K DAVIES A1 A HOLLMAN YR 1998 UL http://heart.bmj.com/content/80/4/318.abstract AB