RT Journal Article SR Electronic T1 Assessment of left ventricular function during exercise; the use of radionuclide cineangiography JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 225 OP 227 VO 47 IS 3 A1 Jeffrey S. Borer YR 1980 UL http://www.ccjm.org/content/47/3/225.abstract AB