Kazem, Nadia M, and Maha S Mahmood. “Assessment of Serum Interleukin-1β and Its Correlation With Periodontal Health Status During Pregnancy”. Journal of Baghdad College of Dentistry, vol. 26, no. 2, June 2014, pp. 111-5, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/459.