Palak Mayur Shah, Geetha RV, and Lakshmi Thangavelu. “Prevalence of Periodontitis Among Smokers and Non-Smokers”. International Journal of Research in Pharmaceutical Sciences 10, no. 2 (April 14, 2019): 1161-1166. Accessed November 18, 2019. https://pharmascope.org/index.php/ijrps/article/view/398.