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Accumulation of particulate matter in induced sputum in the exposed and nonexposed (control) workers, and in the raw material. Particle size was assessed by a DIPA analyser, as described in the Methods section. *: p<0.05 (independent t-test) for accumulated particles 5–6 μm; #: p<0.05 (independent t-test) for accumulated particles 0.1–1 μm.
