5. Yoo KH, Kim YS, Sheen SS, et al. Prevalence of chronic obstructive pulmonary disease in Korea: the fourth Korean National Health and Nutrition Examination Survey, 2008. Respirology 2011;16:659–665.
7. Hurst JR, Skolnik N, Hansen GJ, et al. Understanding the impact of chronic obstructive pulmonary disease exacerbations on patient health and quality of life. Eur J Intern Med 2020;73:1–6.
12. Yang IA, Jenkins CR, Salvi SS. Chronic obstructive pulmonary disease in never-smokers: risk factors, pathogenesis, and implications for prevention and treatment. Lancet Respir Med 2022;10:497–511.
15. US Preventive Services Task Force, Mangione CM, Barry MJ, et al. Screening for chronic obstructive pulmonary disease: US Preventive Services Task Force reaffirmation recommendation statement. JAMA 2022;327:1806–1811.
18. Korean Academy of Tuberculosis and Respiratory Diseases. COPD clinical practice guideline 2024. Korean Academy of Tuberculosis and Respiratory Diseases; 2024.
21. Inha University Industry-Academia Cooperation Foundation. Validity analysis study on the introduction of test items in the National Health Screening Program (chronic obstructive pulmonary disease) [final report]. Korea Centers for Disease Control and Prevention; 2020.
22. Halpin DMG, Decramer M, Celli BR, et al. Effect of a single exacerbation on decline in lung function in COPD. Respir Med 2017;128:85–91.
25. Kim C, Yoo KH, Rhee CK, et al. Health care use and economic burden of patients with diagnosed chronic obstructive pulmonary disease in Korea. Int J Tuberc Lung Dis 2014;18:737–743.
28. Sanchis J, Gich I, Pedersen S; Aerosol Drug Management Improvement Team (ADMIT). Systematic review of errors in inhaler use: has patient technique improved over time? Chest 2016;150:394–406.
29. Price DB, Román-Rodríguez M, McQueen RB, et al. Inhaler errors in the CRITIKAL study: type, frequency, and association with asthma outcomes. J Allergy Clin Immunol Pract 2017;5:1071–1081.
31. Bhatt SP, Soler X, Wang X, et al. Association between functional small airway disease and FEV
1 decline in chronic obstructive pulmonary disease. Am J Respir Crit Care Med 2016;194:178–184.
33. Pascoe S, Barnes N, Brusselle G, et al. Blood eosinophils and treatment response with triple and dual combination therapy in chronic obstructive pulmonary disease: analysis of the IMPACT trial. Lancet Respir Med 2019;7:745–756.