Validity of the periodontal disease surveillance self‑report questionnaire in a Nigerian population. Port Harcourt Medical Journal, [S. l.], v. 11, n. 2, p. 84–89, 2017. DOI: 10.60787/phmj.v11i2.144. Disponível em: http://mail.phmj.org.ng/index.php/home/article/view/144. Acesso em: 15 may. 2025.