Anjum, Amin, Muhammad Khaqan Khalid, Smavia Shafiq, Tanzeel ur Rehman Mustafa, and Asvad Munir. 2025. “Association of ECG Lead I Sign in Patients of Chronic Obstructive Pulmonary Disease”. Indus Journal of Bioscience Research 3 (4):618-22. https://doi.org/10.70749/ijbr.v3i4.973.