Wulandari, Pitu, Dody Widkaja, Aini Hariyani Nasution, Armia Syahputra, and Gebby Gabrina. “Association Between Age, Gender and Education Level With the Severity of Periodontitis in Pre-Elderly and Elderly Patients”. Dental Journal 55, no. 1 (March 1, 2022): 16–20. Accessed August 2, 2024. https://e-journal.unair.ac.id/MKG/article/view/31363.