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Associations Between Measurement RV, RV/TLC, and FRC/TLC with Clinical Symptoms in COPD Patients in Persahabatan Hospital. J Respirol Indones [Internet]. 2023 Oct. 31 [cited 2025 Aug. 19];43(4):239-46. Available from: http://www.jurnalrespirologi.org/index.php/jri/article/view/571