Authors: R Peto; R Collins; D Sackett; J Darbyshire; A Babiker; M Buyse; H Stewart; M Baum; A Goldhirsch; G Bonadonna; P Valagussa; L Rutqvist; D Elbourne; C Davies; O Dalesio; M Parmar; C Hill; M Clarke; R Gray; R Doll Journal: Control Clin Trials Date: 1997-02