RT Journal Article SR Electronic T1 Prognostic significance of a normal or nearly normal coronary arteriogram JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 183 OP 184 VO 47 IS 3 A1 Proudfit, William L. YR 1980 UL http://www.ccjm.org/content/47/3/183.abstract AB