Multilevel somatosensory evoked potentials (SEPs) for spinal cord monitoring in descending thoracic and thoracoabdominal aortic surgery. - Guérit,J.M.; Verhelst,R.; Rubay,J.; Khoury,G.; Matta,A.; Dion,R. (Eur J Cardiothorac Surg, 1996)