Neurochemical effects of motor cortex stimulation in the periaqueductal gray during neuropathic pain - Andrade, Emerson Magno de; Martinez, Raquel C. R; Pagano, Rosana L; Lopes, Patricia S. S; Auada, Aline Vivian Vatti; Gouveia, Flavia V; Antunes, Geiza F; Assis, Danielle V; Lebrun, Ivo; Fonoff, Erich Talamoni (Journal of neurosurgery, 2020)