Authors: M R Knowles; N L Church; W E Waltner; J R Yankaskas; P Gilligan; M King; L J Edwards; R W Helms; R C Boucher Journal: N Engl J Med Date: 1990-04-26 Impact factor: 91.245
Authors: A Graham; A Hasani; E W Alton; G P Martin; C Marriott; M E Hodson; S W Clarke; D M Geddes Journal: Eur Respir J Date: 1993-10 Impact factor: 16.671