The Effect of Roflumilast on Absolute Neutrophil Count, MMP-9 Serum, % VEP1 Value, and CAT Scores in Stable COPD Patients. J Respirol Indones [Internet]. 2022 Apr. 18 [cited 2025 Jul. 13];42(2):141-50. Available from: http://jurnalrespirologi.org/index.php/jri/article/view/265