Sanaullah Tareen, Mohammad Yasin, Aria Masoom, Zafar Iqbal, Amjad Mahboob, and Samrina Sadaf. 2023. “Influenza Vaccination Rate, Awareness &Amp; Risk of Acute Exacerbation of Chronic Obstructive Pulmonary Disease (COPD): A Tertiary Care Cross-Sectional Analysis”. Pakistan Journal of Chest Medicine 29 (1):36-41. https://www.pjcm.net/index.php/pjcm/article/view/773.