Antiaversive effects of cannabinoids: is the periaqueductal gray involved? - Moreira, Fabrício de Araújo; Aguiar, Daniele Cristina de; Campos, Alline Cristina de; Lisboa, Sabrina Francesca de Souza; Terzian, Ana Luisa Bernardes; Moraes, Leonardo Resstel Barbosa; Guimarães, Francisco Silveira (Neural Plasticity, 2009)