Vijayaraj, S., G. Ari, S. Rajendran, J. Mahendra, and A. Namasivayam. “Comparison of the Serum and Salivary Levels of NT-ProBNP in Systemically Healthy Subjects With Mild, Moderate and Severe Chronic Periodontitis”. International Journal Of Drug Research And Dental Science, Vol. 4, no. 1, Feb. 2022, pp. 40-48, doi:10.36437/ijdrd.2022.4.1.F.