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FEV1 before and after EBV treatment. At 6 months after the treatment, FEV1 went back to the level before the procedure in most of the patients, except in the patient 3, whose FEV1 increased from 35.1% to 49.0% of predicted value. FEV1, forced expiratory volume in 1 s; EBV, endobronchial valve.
