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Boeck, Lucas; Gensmer, Anna; Nyilas, Sylvia Meryl; Stieltjes, Bram; Re, Thomas J; Tamm, Michael; Latzin, Philipp; Stolz, Daiana (2016). Single-Breath Washout Tests to Assess Small Airway Disease in COPD. Chest, 150(5), pp. 1091-1100. American College of Chest Physicians 10.1016/j.chest.2016.05.019