External validation of the AJCC Cancer Staging Manual, 8th edition, in an independent cohort of oral cancer patients - Matos, Leandro Luongo; Dedivitis, Rogerio Aparecido; Kulcsar, Marco Aurélio Vamondes; Mello, Evandro Sobroza de; Alves, Venancio Avancini Ferreira; Cernea, Claudio Roberto (Oral Oncology, 2017)