Mishra R, Daga M K, Rohatgi I, Mawari G, Kumar N, Hira H. Dyspnea, Obstruction, Smoking, Exacerbation Index, and Chronic Obstructive Pulmonary Disease Test Score: Correlation in Predicting Outcomes in Patients with Chronic Obstructive Pulmonary Disease Exacerbations. Indian J Chest Dis Allied Sci 2022; 64 (3):153-159.