RT Journal Article SR Electronic T1 Unusual method for occlusive coronary sinus angiography JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 51 OP 51 DO 10.1136/heart.90.1.51 VO 90 IS 1 A1 Strohmer, B A1 Kofler, H-J YR 2004 UL http://heart.bmj.com/content/90/1/51.abstract AB