Ponnathota, V., S. Gogineni, and S. Kasireddy. “Evaluation of Efficacy and Utility of Spirometry Data in Elderly (>65years) Individuals With or Without Lung Diseases”. International Journal of Advances in Medicine, vol. 6, no. 1, Jan. 2019, pp. 1-5, doi:10.18203/2349-3933.ijam20185109.