Mustafa, S. A.-Q., H. T. Nanakaly, and H. W. Azeez. “Assessment of Interleukin-1β in Saliva of Smoker and Non-Smoker Patients With Chronic Periodontitis”. Erbil Dental Journal (EDJ), vol. 4, no. 2, Feb. 2022, pp. 190-8, doi:10.15218/edj.2021.25.