Assertion: benzene's use | /r/HasAspect | its limitations
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Source sentences:
text: Although using task-based exposure levels in epidemiology has its limitations (Cherrie, 1996: Verma et al 2001), which summarized data from several studies evaluating benzene exposure to employees in petroleum industries, explicitly recommend moving toward task-based exposure assessments as opposed to long-term time weighted average estimates for the petroleum industry (Verma et al., 2001).