RT Journal Article SR Electronic T1 Mitral valvar grafts JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 56 OP 59 DO 10.1136/hrt.33.Suppl.56 VO 33 IS Suppl A1 Marian I. Ionescu YR 1971 UL http://heart.bmj.com/content/33/supplement/56.abstract AB