RT Journal Article SR Electronic T1 Clinical anatomy of the aortic root JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 670 OP 673 DO 10.1136/heart.84.6.670 VO 84 IS 6 A1 Robert H Anderson YR 2000 UL http://heart.bmj.com/content/84/6/670.abstract AB