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Changes in spirometry, carbon monoxide diffusing capacity (DLco) (all data expressed as %‐predicted), body mass index (BMI), oxygen saturation in room air, serum lactate dehydrogenase (LDH) level, and 6‐min walking test (6‐MWT) results during follow‐up. FEF25–75, forced expiratory flow between 25% and 75% of expired vital capacity; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; SpO2, peripheral oxygen saturation; TP, treatment period.
