Human health effects of tetrachloroethylene: key findings and scientific issues.

There was a decreasing trend ( p < 0.05) for visual contrast sensitivity in the residential population achieving the maximum contrast sensitivity score at 6 cycles per degree, with 28.3% in the referent group versus 8.3% in the highest exposed (> 100 μg/m 3 ) group ( Storm et al. 2011 ).

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