“PREVALENCE OF PULMONARY HYPERTENSION IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE PATIENTS AND ITS CORRELATION WITH THE SEVERITY OF DISEASE”. The Research of Medical Science Review 3, no. 1 (January 14, 2025): 625–634. Accessed June 25, 2025. https://www.thermsr.com/index.php/Journal/article/view/422.