%0 Journal Article %A E B Raftery %A P Cocker %A W W Holland %T Value of electrocardiogram in population surveys. An attempt to improve interpretation. %D 1971 %R 10.1136/hrt.33.6.837 %J British Heart Journal %P 837-840 %V 33 %N 6 %U https://heart.bmj.com/content/heartjnl/33/6/837.full.pdf