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. Author manuscript; available in PMC: 2021 Oct 18.
Published in final edited form as: Environ Int. 2019 Jul 9;130:104884. doi: 10.1016/j.envint.2019.05.078

Fig. 1.

Fig. 1.

a) Illustration of how outcome-specific criteria fits into systematic review process; b) Study evaluation domains and evaluation classifications for determining overall study confidence.