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. Author manuscript; available in PMC: 2019 Jun 5.
Published in final edited form as: Environ Int. 2019 Feb 4;125:245–251. doi: 10.1016/j.envint.2019.01.073

Fig. 2.

Fig. 2.

Association between daily PM2.5 concentration and relative risk of total mortality using random-effect meta-regression with a natural cubic spline model for PM2.5 with 2 knots (Model 1).