Gudagunti, A. K., I. Hasabi, and A. S. “A Study of Clinical Profile of Patients With Chronic Pulmonary Obstructive Disease at a Tertiary Care Centre in North Karnataka, India”. International Journal of Advances in Medicine, vol. 6, no. 2, Mar. 2019, pp. 455-9, doi:10.18203/2349-3933.ijam20191074.