Adnan Riaz, Ahmad Ashar Ghuman, Sabeen Khalid. “Assessment of Serum Levels of the Matrix-Metalloproteinase-9, Prostaglandin E-2 and Cyclo-Oxygenase-2 As a Candidate Biomarker of Chronic Obstructive Pulmonary Disease (COPD)”. Pakistan Journal of Medical & Health Sciences 16, no. 11 (January 8, 2023): 439. Accessed December 22, 2024. https://pjmhsonline.com/index.php/pjmhs/article/view/3431.