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3. Low-level lead exposure and mortality in US adults: a population-based cohort study
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5. Occupational Safety and Health Administration (OSHA): “Regulation Standards for General and Construction Industry – 29CFR: Standard Numbers 1910.1025 and 1926.62.” Available at https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10030 (accessed October 2, 2017).