Harshvardhan, Leeneshwar, Tara Chand, Sudhir Mehta, Amandeep Singh, and Deepak Maheshwari. “Comparative Study of CA-125 and 2D Echo for Detection of Right Ventricular Failure in COPD Patients”. International Journal of Advances in Medicine 5, no. 4 (July 23, 2018): 1053–1056. Accessed October 12, 2025. https://www.ijmedicine.com/index.php/ijam/article/view/1145.