Mohammed-Salih, Dhamiaa M, and Wesal A Al-Obaidi. 2013. “Periodontal Health and Salivary Interleukin -6 Among Preterm Postpartum Women”. Journal of Baghdad College of Dentistry 25 (2): 140-42. https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/242.