Perlite toxicology and epidemiology--a review.

Inhal Toxicol · 2014 · PMC4002636 · PMID 24601903

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a decreasing trendno p-value reported

Then for 1999–2009, on a year-by-year basis, there was a decreasing trend in the SMR for total respiratory deaths, which the authors claimed might be related to improvements in the mining-extraction process 6 or to an easier access to health care services.

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