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Figure 4: Graphs displaying the percentage frequency of overall cancer (a), mesothelioma (b), lung cancer pleural secondarisms (c), tuberculosis (d), along the consecutive 6 series of 5 years. Horizontal bars indicate the statistically significant difference between the frequencies (*P < 0.05, **P < 0.001)

Figure 4: Graphs displaying the percentage frequency of overall cancer (a), mesothelioma (b), lung cancer pleural secondarisms (c), tuberculosis (d), along the consecutive 6 series of 5 years. Horizontal bars indicate the statistically significant difference between the frequencies (*<i>P</i> < 0.05, **<i>P</i> < 0.001)