Authors: P Tugwell; C Bombardier; M Gent; K J Bennett; W G Bensen; S Carette; A Chalmers; J M Esdaile; A V Klinkhoff; G R Kraag Journal: Lancet Date: 1990-05-05 Impact factor: 79.321
Authors: J Brynskov; L Freund; S N Rasmussen; K Lauritsen; O S de Muckadell; N Williams; A S MacDonald; R Tanton; F Molina; M C Campanini Journal: N Engl J Med Date: 1989-09-28 Impact factor: 91.245
Authors: R H Wiesner; J Ludwig; K D Lindor; R A Jorgensen; W P Baldus; H A Homburger; E R Dickson Journal: N Engl J Med Date: 1990-05-17 Impact factor: 91.245