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. 2021 Mar 23;16(3):687–696. doi: 10.1007/s11739-021-02674-3

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© The Author(s) 2021, corrected publication 2022

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Fig. 3 — Percentage change in patients COPD GOLD stage from baseline in COPD-heated tobacco product users and COPD controls. COPD chronic obstructive pulmonary disease, HTP heated tobacco products, GOLD Global initiative in Obstructive Lung Disease, BL baseline, M months