Middle mesial canals in mandibular first molars: a micro-CT study in different populations - Versiani, Marco Aurélio; Ordinola-Zapata, Ronald; Keles, Ali; Alcin, Hatice; Bramante, Clóvis Monteiro; Pécora, Jesus Djalma; Sousa-Neto, Manoel Damião (Archives of Oral Biology, 2016)