Hegab, Marwa, and Marwa Alnawawy. “The Prevalence of Gingival Recession in the Egyptian Population”. Perio J 4, no. 1 (February 11, 2020): 1-10. Accessed April 6, 2020. https://www.perioj.com/ojs/index.php/perioj/article/view/2020.a1.