Authors: J M Elwood; J C Pearson; R J Madeley; R F Logan; M W Beaver; P A Gillies; J Little; A Langham Journal: J Epidemiol Community Health Date: 1986-09 Impact factor: 3.710
Authors: S D Fihn; M B McDonell; D Vermes; J G Henikoff; D C Martin; C M Callahan; D L Kent; R H White Journal: J Gen Intern Med Date: 1994-03 Impact factor: 5.128