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Univ Ulsan, Coll Med, Asthma Ctr, Dept Pulm & Crit Care Med, Seoul 138736, South Korea
Univ Ulsan, Coll Med, Asan Med Ctr, Clin Res Ctr Chron Obstruct Airway Dis, Seoul 138736, South Korea Dankook Univ, Dept Nursing, Cheonan Si 330714, Chungnam, South Korea