Talib, Haider, and Maha Ahmed. “Assessment of Salivary Lactoferrin and PH Levels and Their Correlation With Gingivitis and Severity of Chronic Periodontitis (Part: 2)”. Journal of Baghdad College of Dentistry 30, no. 1 (March 15, 2018): 46-52. Accessed November 30, 2019. http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/2441.