TY - JOUR T1 - PROCEEDINGS OF THE BRITISH CARDIAC SOCIETY JF - British Heart Journal JO - Heart SP - 304 LP - 310 DO - 10.1136/hrt.9.4.304 VL - 9 IS - 4 A2 - , Y1 - 1947/10/01 UR - http://heart.bmj.com/content/9/4/304.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -