Authors: S J Veldhuyzen van Zanten; N Flook; N Chiba; D Armstrong; A Barkun; M Bradette; A Thomson; F Bursey; P Blackshaw; D Frail; P Sinclair Journal: CMAJ Date: 2000-06-13 Impact factor: 8.262
Authors: M M Morales Suárez-Varela; M A Pérez-Benajas; V J Girbes Pelechano; A Llopis-González Journal: Eur J Epidemiol Date: 1998-06 Impact factor: 8.082