RT Journal Article SR Electronic T1 Functional collaterals in coronary artery spasm JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 396 OP 397 VO 127 IS 5 A1 R. J. Burns A1 B. Z. Bar-Shlomo A1 P. R. McLaughlin YR 1982 UL http://www.cmaj.ca/content/127/5/396.abstract