Pettenati-Soubayroux, I., J. J. Bonfil, G. Susini, and G. Boëtsch. “Periodontal Disease and Oral Ageing: Influence of Genetic (HLA) and Environmental Factors”. Journal of Biological Research - Bollettino della Società Italiana di Biologia Sperimentale 79, no. 1 (December 31, 2003). Accessed May 14, 2024. https://www.pagepressjournals.org/jbr/article/view/10563.