Risk factors for oral squamous cell carcinoma in young and older Brazilian patients: a comparative analysis - Hirota, Sílvio Kenji; Braga, Fábio do Prado Florence; Penha, Sibele Sarti; Sugaya, Norberto Nobuo; Migliari, Dante Antônio (Medicina Oral Patologia Oral Cirurgia Bucal, 2008)