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Frequency distribution of age (years), cumulative smoking exposure (pack-years), FEV1/FVC (%), FEV1 (% ref.), diffusing capacity of the lung for carbon monoxide (DLCO) (% ref.) and KLCO (% ref.) in patients (red; n=92) and controls (green; n=197). Dotted vertical lines represent mean values. For further explanations, see text.
