“Serum Matrix Metalloproteinase 9 Level, Blood Absolute Neutrophil Count in Correlation With Diffusion Capacity and Exercise Capacity of Stable Chronic Obstructive Pulmonary Disease Patients at Universitas Sebelas Maret Hospital”. Jurnal Respirologi Indonesia, vol. 44, no. 3, July 2024, pp. 243-52, https://doi.org/10.36497/jri.v44i3.400.