Comparison of the effects of propofol and sevoflurane combined with remifentanil on transcranial electric motor-evoked and somatosensory-evoked potential monitoring during brainstem surgery - Hernández-Palazón, J; Izura, V; Fuentes-García, D; Piqueras-Pérez, C; Doménech-Asensi, P; Falcón-Araña, L (J Neurosurg Anesthesiol, 2015)