Frequency of accessory mental foramen and anatomical variability of mental nerve anterior loop in a Peruvian population: a retrospective cone-beam computed tomography study - Tofiño-Medina, José Heberth; Arriola-Guillén, Luis Ernesto; Rodríguez-Cárdenas, Yalil Augusto; Aliaga-Del Castillo, Aron; Ruíz-Mora, Gustavo Armando; Guerrero, María Eugenia (Journal of Oral Research, 2020)