RT Journal Article SR Electronic T1 Minimal access surgery. JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 304 OP 306 DO 10.1136/hrt.77.4.304 VO 77 IS 4 A1 Treasure, T. YR 1997 UL http://heart.bmj.com/content/77/4/304.abstract AB