Refractory craniofacial pain: is there a role of periodontal disease as a comorbidity? - Fabri, Gisele Maria Campos; Siqueira, Silvia Regina Dowgan Tesseroli de; Simione, Caio; Nasri, Cibele; Teixeira, Manoel Jacobsen; Siqueira, José Tadeu Tesseroli (Arquivos de Neuro-Psiquiatria, 2009)