TY - JOUR T1 - Valve replacement. JF - British Heart Journal JO - Heart SP - 723 LP - 727 DO - 10.1136/hrt.32.6.723 VL - 32 IS - 6 AU - L G Davies Y1 - 1970/11/01 UR - http://heart.bmj.com/content/32/6/723.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -