Authors: W O Spitzer; D L Sackett; J C Sibley; R S Roberts; M Gent; D J Kergin; B C Hackett; A Olynich Journal: N Engl J Med Date: 1974-01-31 Impact factor: 91.245
Authors: G Daker-White; A J Carr; I Harvey; G Woolhead; G Bannister; I Nelson; M Kammerling Journal: J Epidemiol Community Health Date: 1999-10 Impact factor: 3.710