RT Journal Article SR Electronic T1 Coronary artery spasm; clinical manifestations and angiographic correlates JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 166 OP 167 VO 47 IS 3 A1 Heupler, Frederick A. YR 1980 UL http://www.ccjm.org/content/47/3/166.abstract AB