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Funnel plots of (a) % predicted forced expiratory volume in 1 s and (b) % predicted forced vital capacity, (c) forced expiratory volume in 1 s/forced vital capacity ratio (%), (d) forced expiratory flow between 25% and 75% of total lung capacity, (e) % predicted peak expiratory flow, and (f) % predicted diffusion capacity of the lungs for carbon monoxide.
