Kumar, S., D. D. Gupta, M. Sarkar, and R. . “Assessment of Arterial Stiffness in Stable Patients of Chronic Obstructive Pulmonary Disease: A Prospective Case Control Study”. International Journal of Basic & Clinical Pharmacology, vol. 7, no. 11, Oct. 2018, pp. 2078-85, doi:10.18203/2319-2003.ijbcp20184314.