PT - JOURNAL ARTICLE ED - , TI - An Introduction to Electrocardiography DP - 1964 Sep 01 TA - The Journal of the College of General Practitioners PG - 253--253 VI - 8 IP - 2 4099 - http://bjgp.org/content/8/2/253.1.short 4100 - http://bjgp.org/content/8/2/253.1.full SO - J Coll Gen Pract1964 Sep 01; 8