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Meta-analysis of studies of GSTM1 null genotype and bladder cancer risk (A) and case-only meta-analysis of studies of GSTM1 null genotype, cigarette smoking and bladder cancer. The horizontal axis plots odds ratios and 95% CI on a logarithmic scale. The size of black circles are proportional to the study size for studies with 50 or more cases, Disagreements between the number of cases for the same study in panels A and B are due to cases with missing smoking information.
