Oral manifestations of vitamin B12 deficiency: a case report - Pontes, Hélder Antonio Rebelo; Conte Neto, Nicolau; Ferreira, Karen Bechara; Fonseca, Felipe Paiva; Vallinoto, Gizelle Monteiro; Pontes, Flávia Sirotheau Corrêa; Pinto Júnior, Décio dos Santos (Journal of the Canadian Dental Association, 2009)