Cartwright R A, Gadian T, Garland J B, Bernard S M
J Epidemiol Community Health. 1981 Mar;35(1):35-8. doi: 10.1136/jech.35.1.35.
The influence of urinary malignant cell cytology screening has been explored in an industrial population. Survival was prolonged in the screened group partly because a greater proportion of early stages disease was being diagnosed, and partly because of other differences in the screened group which have yet to be defined.