S. Pawar, Rupali, and Subodhini A. Abhang. 2017. “Evaluation of Neutrophil Elastase/ Alpha-1-Antitrypsin Ratio in Different Stages of Chronic Obstructive Pulmonary Disease (COPD) Patients”. International Journal of Medical Research and Review 5 (7), 664-74. https://doi.org/10.17511/ijmrr.2017.i07.04.