Endoscopic-guided percutaneous radiofrequency cordotomy Technical note - Fonoff, Erich Talamoni; Oliveira, Ywzhe Sifuentes Almeida de; Contreras, William Omar Lopez; Alho, Eduardo Joaquim Lopes; Alves, Nilton Lara; Teixeira, Manoel Jacobsen (Journal of Neurosurgery, 2010)