Wulandari, Pitu, Dody Widkaja, Aini Hariyani Nasution, Armia Syahputra, and Gebby Gabrina. 2022. “Association Between Age, Gender and Education Level With the Severity of Periodontitis in Pre-Elderly and Elderly Patients”. Dental Journal 55 (1):16-20. https://doi.org/10.20473/j.djmkg.v55.i1.p16-20.