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Figure 1. Diagram of study selection
Figure 2. Pooled mean of FEV1 in included studies
Figure 3. Pooled mean of FVC in included studies
Figure 4. Pooled mean of FEV1/FVC in included studies
Figure5. Pooled mean of FEF25-75 in included studies
Figure6. Pooled mean of DLCO in included studies
Table1. Characteristics of eligible studies included in meta-analysis.