RT Journal Article SR Electronic T1 Percutaneous transluminal coronary angioplasty: what next? JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 321 OP 322 DO 10.1136/hrt.63.6.321 VO 63 IS 6 A1 U Sigwart YR 1990 UL http://heart.bmj.com/content/63/6/321.abstract AB