| http://www.w3.org/ns/prov#value | - Exposure monitoring conducted in the early 1980s showed exposures to 0-20 ppm H2S, 0-15 ppm methyl mercaptan, 0-12 ppm dimethyl sulfide and 0-1.5 ppm dimethyl disulfide.(57) This study is limited by factors such as the lack of control over other potential causes of cardiovascular disease.
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