RT Journal Article SR Electronic T1 Acute myocardial infarction in a 21-year-old male with normal selective coronary arteriogram JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 843 OP 844 VO 105 IS 8 A1 J. R. Ledwich YR 1971 UL http://www.cmaj.ca/content/105/8/843.abstract