Frontiers in Public Health

When air gets heavy: joint PM2.5 and ambient humidity exposure, frailty, and stroke

Figure 1. Flowchart of participant selection in CHARLS and the single-center hospital-based study.
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Figure 1. Flowchart of participant selection in CHARLS and the single-center hospital-based study.Flowchart of participant selection in CHARLS and the single-center hospital-based study.Sun et al.
Cohort study of 17,197 peoplePopulations

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