Sari, A. P. ., R. Ratnawati, W. . Aniwidyaningsih, S. L. . Andarini, and F. . Yunus. “Neutrophyl – Lymphocyte Ratio (NLR) and C-Reactive Protein (CRP) Levels in Stable and Exacerbated Chronic Obstructive Pulmonary Disease (COPD) Patients in Persahabatan Hospital Jakarta”. Respiratory Science, vol. 2, no. 2, Feb. 2022, pp. 78-91, doi:10.36497/respirsci.v2i2.38.