Authors: J Masip; A J Betbesé; J Páez; F Vecilla; R Cañizares; J Padró; M A Paz; J de Otero; J Ballús Journal: Lancet Date: 2000 Dec 23-30 Impact factor: 79.321
Authors: M Antonelli; G Conti; M Rocco; M Bufi; R A De Blasi; G Vivino; A Gasparetto; G U Meduri Journal: N Engl J Med Date: 1998-08-13 Impact factor: 91.245