E. S. Tadjoeddin, N. P. Dewi, Y. Soeroso, B. Sulijaya, and N. Natalina, “Stage and grade determination of periodontitis accompanied by systemic conditions and diseases according to American Academy of Periodontology 2017 Classification: Study at Dental Hospital, Faculty of Dentistry, Universitas Indonesia”, J Dentomaxillofac Sci, vol. 6, no. 2, pp. 88–93, Aug. 2021.