Authors: W G Daniel; U Nellessen; E Schröder; B Nonnast-Daniel; P Bednarski; P Nikutta; P R Lichtlen Journal: J Am Coll Cardiol Date: 1988-06 Impact factor: 24.094
Authors: S L Kopecky; B J Gersh; M D McGoon; J P Whisnant; D R Holmes; D M Ilstrup; R L Frye Journal: N Engl J Med Date: 1987-09-10 Impact factor: 91.245