PT - JOURNAL ARTICLE ED - , TI - Principles of Clinical Electrocardiography DP - 1964 Nov 01 TA - The Journal of the College of General Practitioners PG - 381--381 VI - 8 IP - 3 4099 - http://bjgp.org/content/8/3/381.1.short 4100 - http://bjgp.org/content/8/3/381.1.full SO - J Coll Gen Pract1964 Nov 01; 8