KAUR, S.; KHURANA, A.; DHOAT, P. S.; MOHAN, G. Cardiac evaluation of chronic obstructive pulmonary disease patients by ECHO and its correlation with different grades of severity of chronic obstructive pulmonary disease. International Journal of Advances in Medicine, [S. l.], v. 4, n. 1, p. 98–102, 2017. DOI: 10.18203/2349-3933.ijam20170016. Disponível em: https://www.ijmedicine.com/index.php/ijam/article/view/215. Acesso em: 28 mar. 2025.