Authors: Kirsi Lillberg; Pia K Verkasalo; Jaakko Kaprio; Lyly Teppo; Hans Helenius; Markku Koskenvuo Journal: Am J Epidemiol Date: 2003-03-01 Impact factor: 4.897
Authors: D F Stroup; J A Berlin; S C Morton; I Olkin; G D Williamson; D Rennie; D Moher; B J Becker; T A Sipe; S B Thacker Journal: JAMA Date: 2000-04-19 Impact factor: 56.272