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. 2020 Sep 14;128(9):095002. doi: 10.1289/EHP6980

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Figure 1 is a flow diagram, having five stages. Stage 1: Problem formulation leads to Describe methods for review. Stage 2: Describe methods for review leads to Identify evidence: Animal human mechanistic. Stage 3: Identify evidence: Animal human mechanistic leads to Evaluate studies. Stage 4: Evaluate studies leads to Integrate evidence. Stage 5: Integrate evidence leads to Hazard Identification. — Schematic for systematic review. Adapted from National Research Council (2014).