RT Journal Article SR Electronic T1 COMMUNITY ELECTROCARDIOGRAPHY JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 539 OP 540 VO 24 IS 145 A1 T. C. Bradford YR 1974 UL http://bjgp.org/content/24/145/539.3.abstract AB