A. Nurfaizi, I. A. Marhana, G. M. Sari, and A. Bakhtiar, “Correlation between FEV1% Predicted and Blood Eosinophils in Patients with Exacerbations of Chronic Obstructive Pulmonary Disease (COPD)”, JR, vol. 7, no. 2, pp. 59–64, May 2021.