RT Journal Article SR Electronic T1 Natural history of coronary artery disease based on coronary angiography JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 153 OP 155 VO 45 IS 1 A1 Lichtlen, Paul R. YR 1978 UL http://www.ccjm.org/content/45/1/153.abstract AB