Fig. 2

Different methods correcting for verification bias. For the Begg and Greenes method, missing data of non-verified patients were computed, with a= 38, b= 0, c= 109 and d= 523. Legend: (E) Bayesian: Bayesian method excluding patients lost to follow-up (NA) ; (I) Bayesian: Bayesian method imputing NA; H: withrespect to histology; F: with respect to follow-up