Zhang, Chao, Yunfeng Ni, and Dong Han. “Systemic Immune-Inflammation Index and Neutrophil-to-Lymphocyte Ratio As Biomarkers for Acute Exacerbation of Elderly Patients With Chronic Bronchitis”. The Journal of Infection in Developing Countries 20, no. 10 (October 31, 2026): 1464–1472. Accessed November 14, 2026. https://jidc.org/index.php/journal/article/view/43019299.