Authors: J Y Reginster; M P Lecart; R Deroisy; N Sarlet; D Denis; D Ethgen; J Collette; P Franchimont Journal: Lancet Date: 1989 Dec 23-30 Impact factor: 79.321
Authors: B L Riggs; S F Hodgson; W M O'Fallon; E Y Chao; H W Wahner; J M Muhs; S L Cedel; L J Melton Journal: N Engl J Med Date: 1990-03-22 Impact factor: 91.245