Adnan Riaz, Ahmad Ashar Ghuman, Sabeen Khalid 2023. 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, 11 (Jan. 2023), 439. DOI:https://doi.org/10.53350/pjmhs20221611439.