RT Journal Article SR Electronic T1 Anatomy and functional significance of coronary collaterals JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 131 OP 132 VO 47 IS 3 A1 Kaltenbach, Martin A1 Kober, Gilbert YR 1980 UL http://www.ccjm.org/content/47/3/131.abstract AB