Dr. Rakesh Kumar Shahi, Dr. Rajendra Rai, & Dr. P Nigam. (2020). Electrocardiographic Findings and Its Comparison With Chronic Obstructive Pulmonary Disease Severity In Patients: A Prospective Study: Electrocardiographic Findings And Its Comparison With COPD Severity In Patients. National Journal of Integrated Research in Medicine, 11(4), 15–18. Retrieved from http://nicpd.ac.in/ojs-/index.php/njirm/article/view/2852