Feula, Jothi Marie, Dhanalakshmi Y, Gopal Krushna Pal, and Sandhiya S. “Link of Oxidative Stress to Pulmonary Functions Contributed by Matrix Metalloproteinase in South Indian Population-An Observational Study”. International Journal of Clinical and Experimental Physiology 7, no. 2 (July 3, 2020): 77-80. Accessed August 10, 2020. http://ijcep.org/index.php/ijcep/article/view/522.