RT Journal Article SR Electronic T1 Clinical significance of the bicuspid aortic valve JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 81 OP 85 DO 10.1136/heart.83.1.81 VO 83 IS 1 A1 C Ward YR 2000 UL http://heart.bmj.com/content/83/1/81.abstract AB