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Spirometry, DLCO, and 6-min walk test at 3,4 and 6 months of follow-up. Notes: FVC, forced vital capacity; FEV1, forced expiratory volume in 1 s; FEF, forced expiratory flow; DLCO, diffusing capacity of carbon monoxide; VA; alveolar ventilation; KCO, carbon monoxide transfer coefficient; TLC, total lung capacity; 6-MWT, 6-m walk test; 6-MWD, 6-m walk distance; SpO2, oxygen saturation
