Hiyam Al Mozayen, Ebtisam Martan, Khadijah Al Hafiz, Dhai Shaddad, Alya Al Essa, Prof. Sana’a Shafshak. “Presence and Severity of Periodontal Diseases Among Special Health Care Needs Individuals”. International Journal of Emerging Trends in Science and Technology, Vol. 5, no. 05, May 2018, pp. 6615-24, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1263.