RT Journal Article SR Electronic T1 CHEST LEADS IN CLINICAL ELECTROCARDIOGRAPHY JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 49 OP 80 DO 10.1136/hrt.1.1.49 VO 1 IS 1 A1 Paul Wood A1 A. Selzer YR 1939 UL http://heart.bmj.com/content/1/1/49.abstract AB