Authors: W L Peterson; R A Sturdevant; H D Frankl; C T Richardson; J I Isenberg; J D Elashoff; J Q Sones; R A Gross; R W McCallum; J S Fordtran Journal: N Engl J Med Date: 1977-08-18 Impact factor: 91.245
Authors: G H Guyatt; M J Sullivan; E L Fallen; H Tihal; E Rideout; S Halcrow; S Nogradi; M Townsend; D W Taylor Journal: Am J Cardiol Date: 1988-02-01 Impact factor: 2.778