TY - JOUR T1 - ABSTRACTS OF CARDIOLOGY JF - British Heart Journal JO - Heart SP - 571 LP - 576 DO - 10.1136/hrt.18.4.571 VL - 18 IS - 4 A2 - , Y1 - 1956/10/01 UR - http://heart.bmj.com/content/18/4/571.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -